Chapter 1 Introduction to the problems of the biosphere 1.1. Definition of the biosphere What is the biosphere? Let us recall some of its characteristic features. In modern science there are many definitions of the biosphere. We present only a few. The biosphere is a special one, embraced by life

Introduction Here it is, the first paragraph of the book on DNA - about how we are uncovering the stories that have been stored in DNA for thousands and even millions of years, about how DNA helps us unravel the riddles about man, the answers to which seemed to be long ago. lost. Oh yes! I am writing this book

Chapter 8. Introduction to Metabolism Metabolism or metabolism is a set of chemical reactions in the body that provide it with the substances and energy necessary for life. The metabolic process that is accompanied by the formation of simpler

BIOCHEMISTRY (biological chemistry), a science that studies the chemical composition of living objects, the structure and ways of transformation of natural compounds in cells, organs, tissues and whole organisms, as well as the physiological role of individual chemical transformations and the laws of their regulation. The term "biochemistry" was introduced by the German scientist K. Neuberg in 1903. The subject, tasks and methods of biochemistry research relate to the study of all manifestations of life at the molecular level; in the system of natural sciences, it occupies an independent field, equally related to both biology and chemistry. Biochemistry is traditionally divided into static, which deals with the analysis of the structure and properties of all organic and inorganic compounds that make up living objects (cellular organelles, cells, tissues, organs); dynamic, studying the entire set of transformations of individual compounds (metabolism and energy); functional, investigating the physiological role of molecules of individual compounds and their transformations in certain manifestations of vital activity, as well as comparative and evolutionary biochemistry, which determines the similarities and differences in the composition and metabolism of organisms belonging to different taxonomic groups. Depending on the object of study, the biochemistry of humans, plants, animals, microorganisms, blood, muscles, neurochemistry, etc., is distinguished, and as knowledge deepens and their specialization, enzymology, which studies the structure and mechanism of action of enzymes, the biochemistry of carbohydrates, lipids, nucleic acids, becomes independent sections. acids, membranes. Based on the goals and objectives, biochemistry is often divided into medical, agricultural, technical, nutritional biochemistry, etc.

Formation of biochemistry in the 16th-19th centuries. The formation of biochemistry as an independent science is closely connected with the development of other natural science disciplines (chemistry, physics) and medicine. A significant contribution to the development of chemistry and medicine in the 16th - 1st half of the 17th century was made by iatrochemistry. Its representatives investigated digestive juices, bile, fermentation processes, etc., and raised questions about the transformations of substances in living organisms. Paracelsus came to the conclusion that the processes occurring in the human body are chemical processes. J. Silvius attached great importance to the correct ratio of acids and alkalis in the human body, the violation of which, as he believed, underlies many diseases. Ya. B. van Helmont tried to establish how the substance of plants is created. At the beginning of the 17th century, the Italian scientist S. Santorio, using a camera specially designed by him, tried to establish the ratio of the amount of food taken and human excretions.

The scientific foundations of biochemistry were laid in the 2nd half of the 18th century, which was facilitated by discoveries in the field of chemistry and physics (including the discovery and description of a number of chemical elements and simple compounds, the formulation of gas laws, the discovery of the laws of conservation and conversion of energy), the use of chemical methods analysis in physiology. In the 1770s, A. Lavoisier formulated the idea of ​​the similarity of combustion and respiration processes; established that the respiration of humans and animals from a chemical point of view is an oxidation process. J. Priestley (1772) proved that plants emit oxygen necessary for the life of animals, and the Dutch botanist J. Ingenhaus (1779) established that the purification of "spoiled" air is carried out only by the green parts of plants and only in the light (these works laid the foundation for the study of photosynthesis). L. Spallanzani proposed to consider digestion as a complex chain of chemical transformations. By the beginning of the 19th century, a number of organic substances (urea, glycerin, citric, malic, lactic and uric acids, glucose, etc.) were isolated from natural sources. In 1828, F. Wöhler for the first time carried out the chemical synthesis of urea from ammonium cyanate, thereby debunking the idea that had prevailed until that time about the possibility of synthesizing organic compounds only by living organisms and proving the inconsistency of vitalism. In 1835 I. Berzelius introduced the concept of catalysis; he postulated that fermentation is a catalytic process. In 1836, the Dutch chemist G. Ya. Mulder first proposed a theory of the structure of protein substances. Gradually, data were accumulated on the chemical composition of plant and animal organisms and the chemical reactions occurring in them; by the middle of the 19th century, a number of enzymes (amylase, pepsin, trypsin, etc.) were described. In the second half of the 19th century, some information was obtained about the structure and chemical transformations of proteins, fats and carbohydrates, and photosynthesis. In 1850-55, C. Bernard isolated glycogen from the liver and established the fact of its conversion into glucose entering the blood. The works of I. F. Misher (1868) laid the foundation for the study of nucleic acids. In 1870, J. Liebig formulated the chemical nature of the action of enzymes (its basic principles retain their significance to this day); in 1894, E. G. Fisher was the first to use enzymes as biocatalysts for chemical reactions; he came to the conclusion that the substrate corresponds to the enzyme as a "key to a lock". L. Pasteur concluded that fermentation is a biological process that requires living yeast cells, thereby rejecting the chemical theory of fermentation (J. Berzelius, E. Mitcherlich, J. Liebig), according to which the fermentation of sugars is a complex chemical reaction. Clarity in this matter was finally introduced after E. Buchner (1897, together with his brother, G. Buchner) proved the ability of an extract of microorganism cells to cause fermentation. Their work contributed to the knowledge of the nature and mechanism of action of enzymes. Soon A. Garden found that fermentation is accompanied by the incorporation of phosphate into carbohydrate compounds, which served as an impetus for the isolation and identification of carbohydrate phosphorus esters and understanding of their key role in biochemical transformations.

The development of biochemistry in Russia during this period is associated with the names of A. Ya. Danilevsky (studied proteins and enzymes), M. V. Nentsky (studied the pathways of urea formation in the liver, the structure of chlorophyll and hemoglobin), V. S. Gulevich (biochemistry of muscle tissue , extractive substances of muscles), S. N. Vinogradsky (discovered chemosynthesis in bacteria), M. S. Tsveta (created a method of chromatographic analysis), A. I. Bach (peroxide theory of biological oxidation), etc. Russian doctor N. I. Lunin paved the way for the study of vitamins by experimentally proving (1880) the necessity for the normal development of animals of special substances (in addition to proteins, carbohydrates, fats, salts and water). At the end of the 19th century, ideas were formed about the similarity of the basic principles and mechanisms of chemical transformations in various groups of organisms, as well as about the features of their metabolism (metabolism).

The accumulation of a large amount of information on the chemical composition of plant and animal organisms and the chemical processes occurring in them has led to the need for systematization and generalization of data. The first work in this direction was the textbook by I. Simon ("Handbuch der angewandten medicinischen Chemie", 1842). In 1842, J. Liebig's monograph "Die Tierchemie oder die organische Chemie in ihrer Anwendung auf Physiologie und Pathologie" appeared. The first domestic textbook of physiological chemistry was published by A. I. Khodnev, a professor at Kharkov University, in 1847. Periodicals began to appear regularly from 1873. In the second half of the 19th century, special departments were organized at the medical faculties of many Russian and foreign universities (initially they were called departments of medical or functional chemistry). In Russia, for the first time, departments of medical chemistry were created by A. Ya. Danilevsky at Kazan University (1863) and A. D. Bulyginsky (1864) at the medical faculty of Moscow University.

Biochemistry in the 20th century . The formation of modern biochemistry occurred in the 1st half of the 20th century. Its beginning was marked by the discovery of vitamins and hormones, their role in the body was determined. In 1902, E. G. Fisher was the first to synthesize peptides, thereby establishing the nature of the chemical bond between amino acids in proteins. In 1912, the Polish biochemist K. Funk isolated a substance that prevents the development of polyneuritis and called it a vitamin. After that, many vitamins were gradually discovered, and vitaminology became one of the branches of biochemistry, as well as the science of nutrition. In 1913, L. Michaelis and M. Menten (Germany) developed the theoretical foundations of enzymatic reactions, formulated the quantitative laws of biological catalysis; the structure of chlorophyll was established (R. Wilstetter, A. Stoll, Germany). In the early 1920s, AI Oparin formulated a general approach to the chemical understanding of the problem of the origin of life. The enzymes urease (J. Sumner, 1926), chymotrypsin, pepsin and trypsin (J. Northrop, 1930s) were first obtained in crystalline form, which served as evidence of the protein nature of enzymes and impetus for the rapid development of enzymology. In the same years, H. A. Krebs described the mechanism of urea synthesis in vertebrates during the ornithine cycle (1932); A. E. Braunshtein (1937, together with M. G. Kritzman) discovered the reaction of transamination as an intermediate link in the biosynthesis and breakdown of amino acids; O. G. Warburg found out the nature of an enzyme that reacts with oxygen in tissues. In the 1930s, the main stage of studying the nature of fundamental biochemical processes was completed. The sequence of reactions of decomposition of carbohydrates during glycolysis and fermentation (O. Meyerhof, Ya. O. Parnas), the transformation of pyruvic acid in the cycles of di- and tricarboxylic acids (A. Szent-Gyorgyi, H. A. Krebs, 1937) was established, photodecomposition was discovered water (R. Hill, UK, 1937). The works of V. I. Palladin, A. N. Bach, G. Wieland, the Swedish biochemist T. Thunberg, O. G. Warburg and the English biochemist D. Keilin laid the foundations for modern ideas about intracellular respiration. Adenosine triphosphate (ATP) and creatine phosphate have been isolated from muscle extracts. In the USSR, the works of V. A. Engelgardt (1930) and V. A. Belitser (1939) on oxidative phosphorylation and the quantitative characterization of this process laid the foundation for modern bioenergetics. Later, F. Lipman developed ideas about energy-rich phosphorus compounds and established the central role of ATP in cell bioenergetics. Discovery of DNA in plants (Russian biochemists A. N. Belozersky and A. R. Kizel, 1936) contributed to the recognition of the biochemical unity of the plant and animal world. In 1948, A. A. Krasnovsky discovered the reaction of reversible photochemical reduction of chlorophyll, significant progress was made in elucidating the mechanism of photosynthesis (M. Calvin).

The further development of biochemistry is associated with the study of the structure and function of a number of proteins, the development of the main provisions of the theory of enzymatic catalysis, the establishment of fundamental schemes of metabolism, etc. The progress of biochemistry in the 2nd half of the 20th century is largely due to the development of new methods. Thanks to the improvement of the methods of chromatography and electrophoresis, it became possible to decipher the sequences of amino acids in proteins and nucleotides in nucleic acids. X-ray diffraction analysis made it possible to determine the spatial structure of the molecules of a number of proteins, DNA, and other compounds. Using electron microscopy, previously unknown cellular structures were discovered; various cell organelles (including the nucleus, mitochondria, ribosomes) were isolated due to ultracentrifugation; the use of isotope methods made it possible to understand the most complex ways of transformation of substances in organisms, etc. An important place in biochemical research was occupied by various types of radio and optical spectroscopy, mass spectroscopy. L. Pauling (1951, together with R. Corey) formulated ideas about the secondary structure of the protein, F. Sanger (1953) deciphered the structure of the protein hormone insulin, and J. Kendrew (1960) determined the spatial structure of the myoglobin molecule. Thanks to the improvement of research methods, many new ideas have been introduced into the understanding of the structure of enzymes, the formation of their active center, and their work as part of complex complexes. After establishing the role of DNA as a substance of heredity (O. Avery, 1944), special attention is paid to nucleic acids and their participation in the process of transmission of organism traits by inheritance. In 1953, J. Watson and F. Crick proposed a model of the spatial structure of DNA (the so-called double helix), linking its structure with biological function. This event was a turning point in the development of biochemistry and biology in general and served as the basis for the separation of a new science from biochemistry - molecular biology. Studies on the structure of nucleic acids, their role in protein biosynthesis and the phenomena of heredity are also associated with the names of E. Chargaff, A. Kornberg, S. Ochoa, H. G. Koran, F. Sanger, F. Jacob and J. Monod, as well as Russian scientists A. N. Belozersky, A. A. Baev, R. B. Khesin-Lurie, and others. establishing a relationship between the structure of a substance and its biological function. In this regard, studies on the verge of biological and organic chemistry have been developed. This direction became known as bioorganic chemistry. In the 1950s, at the intersection of biochemistry and inorganic chemistry, bioinorganic chemistry was formed as an independent discipline.

Among the undoubted successes of biochemistry are: the discovery of the participation of biological membranes in energy generation and subsequent research in the field of bioenergy; establishment of pathways for the transformation of the most important metabolic products; knowledge of the mechanisms of transmission of nervous excitation, the biochemical foundations of higher nervous activity; elucidation of the mechanisms of transmission of genetic information, regulation of the most important biochemical processes in living organisms (cellular and intercellular signaling), and many others.

Modern development of biochemistry. Biochemistry is an integral part of physical and chemical biology - a complex of interconnected and closely intertwined sciences, which also includes biophysics, bioorganic chemistry, molecular and cellular biology, etc., studying the physical and chemical foundations of living matter. Biochemical research covers a wide range of problems, the solution of which is carried out at the intersection of several sciences. For example, biochemical genetics studies the substances and processes involved in the realization of genetic information, as well as the role of various genes in the regulation of biochemical processes in normal conditions and in various genetic metabolic disorders. Biochemical pharmacology explores the molecular mechanisms of action of drugs, contributing to the development of more advanced and safe drugs, immunochemistry - the structure, properties and interactions of antibodies (immunoglobulins) and antigens. At the present stage, biochemistry is characterized by the active involvement of a wide methodological arsenal of related disciplines. Even such a traditional branch of biochemistry as enzymology, when characterizing the biological role of a particular enzyme, rarely does without directed mutagenesis, turning off the gene encoding the enzyme under study in living organisms, or, conversely, its increased expression.

Although the basic pathways and general principles of metabolism and energy in living systems can be considered established, many details of metabolism and especially its regulation remain unknown. Especially important is the elucidation of the causes of metabolic disorders leading to severe "biochemical" diseases (various forms of diabetes, atherosclerosis, malignant cell degeneration, neurodegenerative diseases, cirrhosis, and many others), and the scientific substantiation of its directed correction (creation of drugs, dietary recommendations). The use of biochemical methods makes it possible to identify important biological markers of various diseases and offer effective methods for their diagnosis and treatment. Thus, the determination of cardiospecific proteins and enzymes in the blood (troponin T and myocardial creatine kinase isoenzyme) allows early diagnosis of myocardial infarction. An important role is given to nutritional biochemistry, which studies the chemical and biochemical components of food, their value and importance for human health, the impact of food storage and processing on food quality. A systematic approach to the study of the entire set of biological macromolecules and low-molecular metabolites of a particular cell, tissue, organ or organism of a certain type has led to the emergence of new disciplines. These include genomics (explores the entire set of genes of organisms and the features of their expression), transcriptomics (establishes the quantitative and qualitative composition of RNA molecules), proteomics (analyzes the entire variety of protein molecules characteristic of an organism) and metabolomics (studies all metabolites of an organism or its individual cells and organs formed in the process of vital activity), actively using the biochemical strategy and biochemical research methods. The applied field of genomics and proteomics - bioengineering associated with the directed design of genes and proteins - has been developed. The directions named above are generated equally by biochemistry, molecular biology, genetics and bioorganic chemistry.

Scientific institutions, societies and periodicals. Scientific research in the field of biochemistry is carried out in many specialized research institutes and laboratories. In Russia, they are located in the system of the Russian Academy of Sciences (including the Institute of Biochemistry, the Institute of Evolutionary Physiology and Biochemistry, the Institute of Plant Physiology, the Institute of Biochemistry and Physiology of Microorganisms, the Siberian Institute of Plant Physiology and Biochemistry, the Institute of Molecular Biology, the Institute of Bioorganic Chemistry), industry academies (in including the Institute of Biomedical Chemistry of the Russian Academy of Medical Sciences), a number of ministries. Works on biochemistry are carried out in laboratories and at numerous departments of biochemical universities. Specialists in biochemistry both abroad and in the Russian Federation are trained at the chemical and biological faculties of universities with special departments; biochemists of a narrower profile - in medical, technological, agricultural and other universities.

In most countries, there are scientific biochemical societies united in the European Federation of Biochemists (Federation of European Biochemical Societies, FEBS) and in the International Union of Biochemists and Molecular Biologists (International Union of Biochemistry, IUBMB). These organizations gather symposiums, conferences, and congresses. In Russia, the All-Union Biochemical Society with numerous republican and city branches was established in 1959 (since 2002, the Society of Biochemists and Molecular Biologists).

There is a large number of periodicals in which works on biochemistry are published. The most famous are: "Journal of Biological Chemistry" (Balt., 1905), "Biochemistry" (Wash., 1964), "Biochemical Journal" (L., 1906), "Phytochemistry" (Oxf.; NY, 1962), " Biochimica et Biophisica Acta” (Amst., 1947) and many others; yearbooks: "Annual Review of Biochemistry" (Stanford, 1932), "Advances in Enzymology and Related Subjects of Biochemistry" (NY, 1945), "Advances in Protein Chemistry" (NY, 1945), "Febs Journal" (originally "European Journal of Biochemistry", Oxf., 1967), "Febs letters" (Amst., 1968), "Nucleic Acids Research" (Oxf., 1974), "Biochimie" (R., 1914; Amst., 1986), " Trends in Biochemical Sciences" (Elsevier, 1976), etc. In Russia, the results of experimental studies are published in the journals "Biochemistry" (M., 1936), "Plant Physiology" (M., 1954), "Journal of Evolutionary Biochemistry and Physiology" ( SPb., 1965), Applied Biochemistry and Microbiology (M., 1965), Biological Membranes (M., 1984), Neurochemistry (M., 1982) and others, review papers on biochemistry - in journals "Successes of modern biology" (M., 1932), "Successes of chemistry" (M., 1932), etc.; Yearbook "Advances in biological chemistry" (M., 1950).

Lit.: Dzhua M. History of Chemistry. M., 1975; Shamin A. M. History of protein chemistry. M., 1977; he is. History of biological chemistry. M., 1994; Fundamentals of Biochemistry: In 3 vols. M., 1981; Strayer L. Biochemistry: In 3 volumes. M., 1984-1985; Lehninger A. Fundamentals of biochemistry: In 3 vols. M., 1985; Azimov A. Brief history of biology. M., 2002; Elliot W., Elliot D. Biochemistry and Molecular Biology. M., 2002; Berg J.M., Tymoczko J.L., Stryer L. Biochemistry. 5th ed. N.Y., 2002; Biochemistry of man: In 2 volumes. 2nd ed. M., 2004; Berezov T. T., Korovkin B. F. Biological chemistry. 3rd ed. M., 2004; Voet D., VoetJ. biochemistry. 3rd ed. N.Y., 2004; Nelson D. L., Cox M. M. Lehninger principles of biochemistry. 4th ed. N. Y., 2005; Elliott W., Elliott D. Biochemistry and molecular biology. 3rd ed. Oxf., 2005; Garrett R. H., Grisham C. M. Biochemistry. 3rd ed. Belmont, 2005.

A. D. Vinogradov, A. E. Medvedev.

In this article we will answer the question of what is biochemistry. Here we will consider the definition of this science, its history and research methods, pay attention to some processes and define its sections.

Introduction

To answer the question of what biochemistry is, it is enough to say that it is a science devoted to the chemical composition and processes occurring inside a living cell of an organism. However, it has many components, having learned which, you can get a more specific idea of ​​​​it.

In some time episodes of the 19th century, the terminological unit "biochemistry" began to be used for the first time. However, it was introduced into scientific circles only in 1903 by a chemist from Germany - Karl Neuberg. This science occupies an intermediate position between biology and chemistry.

Historical facts

To answer the question clearly, what is biochemistry, mankind could only about a hundred years ago. Despite the fact that society used biochemical processes and reactions in ancient times, it did not suspect the presence of their true essence.

Some of the most remote examples are bread-making, wine-making, cheese-making, etc. A number of questions about the medicinal properties of plants, health problems, etc. made a person delve into their basis and nature of activity.

The development of a common set of directions that eventually led to the creation of biochemistry is already observed in ancient times. A scientist-physician from Persia in the tenth century wrote a book on the canons of medical science, where he was able to describe in detail the description of various medicinal substances. In the 17th century, van Helmont proposed the term "enzyme" as a unit of a chemical reagent involved in digestive processes.

In the 18th century, thanks to the work of A.L. Lavoisier and M.V. Lomonosov, the law of conservation of the mass of matter was derived. At the end of the same century, the importance of oxygen in the process of respiration was determined.

In 1827, science made it possible to create a division of biological molecules into compounds of fats, proteins and carbohydrates. These terms are still in use today. A year later, in the work of F. Wöhler, it was proved that the substances of living systems can be synthesized by artificial means. Another important event was the preparation and compilation of the theory of the structure of organic compounds.

The foundations of biochemistry were formed over many hundreds of years, but they adopted a clear definition in 1903. This science became the first discipline from the category of biological, which had its own system of mathematical analyzes.

25 years later, in 1928, F. Griffith conducted an experiment, the purpose of which was to study the mechanism of transformation. The scientist infected mice with pneumococci. He killed the bacteria of one strain and added them to the bacteria of another. The study showed that the process of refining disease-causing agents resulted in the production of nucleic acid, not protein. The list of discoveries is being replenished at the present time.

Availability of related disciplines

Biochemistry is a separate science, but its creation was preceded by an active process of development of the organic section of chemistry. The main difference lies in the objects of study. In biochemistry, only those substances or processes are considered that can occur in the conditions of living organisms, and not outside them.

Ultimately, biochemistry included the concept of molecular biology. They differ among themselves mainly in the methods of action and the subjects they study. At present, the terminological units "biochemistry" and "molecular biology" have come to be used as synonyms.

Availability of sections

To date, biochemistry includes a number of research areas, including:

Branch of static biochemistry - the science of the chemical composition of living things, structures and molecular diversity, functions, etc.

There are a number of sections that study biological polymers of protein, lipid, carbohydrate, amino acid molecules, as well as nucleic acids and the nucleotide itself.

Biochemistry, which studies vitamins, their role and form of influence on the body, possible disturbances in vital processes in case of shortage or excessive quantity.

Hormonal biochemistry is a science that studies hormones, their biological effect, the causes of deficiency or excess.

The science of metabolism and its mechanisms is a dynamic section of biochemistry (includes bioenergetics).

Molecular Biology Research.

The functional component of biochemistry studies the phenomenon of chemical transformations responsible for the functionality of all components of the body, starting with tissues and ending with the whole body.

Medical biochemistry - a section on the patterns of metabolism between body structures under the influence of diseases.

There are also branches of the biochemistry of microorganisms, humans, animals, plants, blood, tissues, etc.

Research and problem solving tools

Biochemistry methods are based on fractionation, analysis, detailed study and consideration of the structure of both a separate component and the whole organism or its substance. Most of them were formed during the 20th century, and the most widely known was chromatography - the process of centrifugation and electrophoresis.



At the end of the 20th century, biochemical methods began to increasingly find their application in the molecular and cellular sections of biology. The structure of the entire human DNA genome has been determined. This discovery made it possible to learn about the existence of a huge number of substances, in particular, various proteins that were not detected during the purification of biomass, due to their extremely low content in the substance.

Genomics has called into question a huge amount of biochemical knowledge and has led to the development of changes in its methodology. The concept of computer virtual simulation appeared.

Chemical component

Physiology and biochemistry are closely related. This is explained by the dependence of the norm of the course of all physiological processes with the content of a different number of chemical elements.



In nature, you can find 90 components of the periodic table of chemical elements, but about a quarter is needed for life. Our body does not need many rare components at all.

The different position of the taxon in the hierarchical table of living beings causes a different need for the presence of certain elements.

99% of the human mass consists of six elements (C, H, N, O, F, Ca). In addition to the main amount of these types of atoms that form substances, we need another 19 elements, but in small or microscopic volumes. Among them are: Zn, Ni, Ma, K, Cl, Na and others.

Protein biomolecule

The main molecules studied by biochemistry are carbohydrates, proteins, lipids, nucleic acids, and the attention of this science is focused on their hybrids.

Proteins are large compounds. They are formed by linking chains of monomers - amino acids. Most living beings obtain proteins through the synthesis of twenty types of these compounds.

These monomers differ from each other in the structure of the radical group, which plays a huge role in the course of protein folding. The purpose of this process is to form a three-dimensional structure. Amino acids are linked together by the formation of peptide bonds.

Answering the question of what biochemistry is, one cannot fail to mention such complex and multifunctional biological macromolecules as proteins. They have more tasks than polysaccharides or nucleic acids to perform.

Some proteins are represented by enzymes and catalyze various reactions of a biochemical nature, which is very important for metabolism. Other protein molecules can act as signaling mechanisms, form cytoskeletons, participate in immune defense, etc.

Some types of proteins are capable of forming non-protein biomolecular complexes. Substances created by the fusion of proteins with oligosaccharides allow the existence of molecules such as glycoproteins, and interaction with lipids leads to the appearance of lipoproteins.

nucleic acid molecule

Nucleic acids are represented by complexes of macromolecules consisting of a polynucleotide set of chains. Their main functional purpose is to encode hereditary information. Nucleic acid synthesis occurs due to the presence of mononucleoside triphosphate macroenergy molecules (ATP, TTP, UTP, GTP, CTP).

The most widespread representatives of such acids are DNA and RNA. These structural elements are found in every living cell, from archaea to eukaryotes, and even viruses.

lipid molecule

Lipids are molecular substances composed of glycerol, to which fatty acids (from 1 to 3) are attached through ester bonds. Such substances are divided into groups according to the length of the hydrocarbon chain, and also pay attention to saturation. The biochemistry of water does not allow it to dissolve compounds of lipids (fats). As a rule, such substances dissolve in polar solutions.



The main task of lipids is to provide energy to the body. Some are part of hormones, can perform a signaling function or carry lipophilic molecules.

carbohydrate molecule

Carbohydrates are biopolymers formed by combining monomers, which in this case are represented by monosaccharides such as, for example, glucose or fructose. The study of plant biochemistry allowed a person to determine that the main part of carbohydrates is contained in them.

These biopolymers find their application in the structural function and the provision of energy resources to the body or cell. In plants, the main storage substance is starch, while in animals it is glycogen.

The course of the Krebs cycle

There is a Krebs cycle in biochemistry - a phenomenon during which the predominant number of eukaryotic organisms receive most of the energy spent on the processes of oxidation of the food they eat.

It can be observed inside cellular mitochondria. It is formed through several reactions, during which reserves of "hidden" energy are released.

In biochemistry, the Krebs cycle is an important part of the overall respiratory process and material metabolism inside cells. The cycle was discovered and studied by H. Krebs. For this, the scientist received the Nobel Prize.

This process is also called the electron transfer system. This is due to the concomitant conversion of ATP to ADP. The first compound, in turn, is engaged in providing metabolic reactions by releasing energy.

Biochemistry and medicine

The biochemistry of medicine is presented to us as a science covering many areas of biological and chemical processes. Currently, there is a whole branch in education that trains specialists for these studies.

Here they study all living things: from bacteria or viruses to the human body. Having the specialty of a biochemist gives the subject the opportunity to follow the diagnosis and analyze the treatment applicable to the individual unit, draw conclusions, etc.



To prepare a highly qualified expert in this field, you need to teach him the natural sciences, medical basics and biotechnological disciplines, they conduct many tests in biochemistry. Also, the student is given the opportunity to practically apply their knowledge.

universities of biochemistry are currently gaining more and more popularity, which is due to the rapid development of this science, its importance for humans, demand, etc.

Among the most famous educational institutions where specialists in this branch of science are trained, the most popular and significant are: Moscow State University. Lomonosov, PSPU im. Belinsky, Moscow State University. Ogareva, Kazan and Krasnoyarsk State Universities and others.

The list of documents required for admission to such universities does not differ from the list for admission to other higher educational institutions. Biology and Chemistry are the main subjects that must be taken upon admission.

Biochemistry is a whole science that studies, firstly, the chemical composition of cells and organisms, and secondly, the chemical processes that underlie their life activity. The term was introduced into the scientific community in 1903 by a German chemist named Carl Neuberg.

However, the processes of biochemistry themselves have been known since ancient times. And on the basis of these processes, people baked bread and cooked cheese, made wine and dressed animal skins, treated diseases with herbs, and then medicines. And all this is based on biochemical processes.

So, for example, without knowing anything about science itself, the Arab scientist and physician Avicenna, who lived in the 10th century, described many medicinal substances and their effect on the body. And Leonardo da Vinci concluded that a living organism can only live in an atmosphere in which a flame can burn.

Like any other science, biochemistry applies its own methods of research and study. And the most important of them are chromatography, centrifugation and electrophoresis.

Biochemistry today is a science that has made a big leap in its development. So, for example, it became known that of all the chemical elements on earth, a little more than a quarter is present in the human body. And most of the rare elements, except for iodine and selenium, are completely unnecessary for a person in order to support life. But such two common elements as aluminum and titanium have not yet been found in the human body. And it is simply impossible to find them - they are not needed for life. And among all of them, only 6 are those that a person needs every day and it is from them that our body consists of 99%. These are carbon, hydrogen, nitrogen, oxygen, calcium and phosphorus.

Biochemistry is a science that studies such important components of products as proteins, fats, carbohydrates and nucleic acids. Today, we know almost everything about these substances.

Some confuse two sciences - biochemistry and organic chemistry. But biochemistry is a science that studies biological processes that occur only in a living organism. But organic chemistry is a science that studies certain carbon compounds, and these are alcohols, and ethers, and aldehydes, and many, many other compounds.

Biochemistry is also a science, which includes cytology, that is, the study of a living cell, its structure, functioning, reproduction, aging and death. Often this branch of biochemistry is called molecular biology.

However, molecular biology, as a rule, works with nucleic acids, but biochemists are more interested in proteins and enzymes that trigger certain biochemical reactions.

Today, biochemistry is increasingly using the developments of genetic engineering and biotechnology. However, in themselves they are also different sciences, which each study their own. For example, biotechnology studies cell cloning methods, and genetic engineering tries to find ways to replace a diseased gene in the human body with a healthy one and thereby avoid the development of many hereditary diseases.

And all these sciences are closely interconnected, which helps them develop and work for the benefit of mankind.