Biomolecules: Chemical Composition Analysis and Sample Questions

Biomolecules are referred to as all the carbon-containing compounds or organic compounds that are present in the living entities. Depending on whether or not the cell forms the matter, things around us are categorized as alive or non-life. All living things are made up of cells, which are the basic building blocks. If we divide a cell further, we can see that it is made up of atoms. Inorganic and organic substances coexist in the cell. As a result, we may deduce from the chemical analysis that everything in the world is made up of the same chemicals. They simply differ in terms of percentage.

Key Terms - Biomolecules, carbon-containing compounds, organic compounds, earth's crust, lipids, carbohydrates, proteins, nucleic acids.

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What are Biomolecules

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There is a great variety of living species in our biosphere. The same chemistry, i.e. elements and compounds, make up all living creatures. Carbon, hydrogen, oxygen, and other elements can be extracted from plant tissue, animal tissue, or microbial paste. According to a non-living matter examination, a piece of rock produces a list of compounds that are identical. However, closer examination reveals that the relative quantity of carbon and hydrogen in living creatures compared to other elements is higher than in the earth's crust; these are Biomolecules. 

In our biosphere, there is a huge range of living species. Now comes the question: Are all living beings made out of the same molecules, i.e. atoms and compounds? In chemistry, you learned how to do elemental analysis. When we do this on plant tissue, animal tissue, or microbial paste, we get a list of components including carbon, hydrogen, oxygen, and a few others, as well as their respective content per unit mass of the living tissue. We get a similar list if we do the same analysis on a chunk of the earth's crust as an example of non-living stuff. A sample of live tissue contains all of the elements found in a sample of the earth's crust. However, a deeper look reveals that every living creature has a higher relative quantity of carbon and hydrogen in relation to other elements than the earth's crust. 

Also read: Genome and Genomics

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Classification of Biomolecules

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Carbohydrates, lipids, nucleic acids, and proteins are all examples of biomolecules. Biomolecules are lifeless and sophisticated organic molecules that come together in a highly specific way to create new life or govern biological events. Carbohydrates, lipids (fats and oils), nucleic acids, and enzymes are examples of these substances.

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Types of Biomolecules

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Biomolecules are divided into four categories Carbohydrates, Proteins, Nucleic acids, and Lipids.

Carbohydrates

Carbohydrates are primarily carbon, hydrogen, and oxygen molecules. Because sugars are their primary constituents, they are also known as saccharides. They are divided into two categories: tiny and huge (complex). Monosaccharides derived monosaccharides, and oligosaccharides are the three types of small carbohydrates (biomacromolecules). Polysaccharides are large carbohydrates (biomacromolecules).

Proteins

Proteins are huge macromolecules that are made up of one or more polypeptides (chains or polymers of amino acids LInked by a peptide bond). The terms polypeptide and protein are frequently interchanged. To qualify for the term, a single polypeptide must be at least 50 amino acids long. There are 20 different kinds of amino acids. A protein is classified as a heteropolymer rather than a homopolymer. A homopolymer is made up of only one kind of monomer that is repeated many times. The most prevalent protein on the planet is CoIIagen. It is the most important component of animal connective tissue. The most prevalent protein in the biosphere is ribulose bisphosphate carboxylase-oxygenase (RuBisCo).

Nucleic Acids

Many lipids contain glycerol and fatty acids. Nucleic acids are divided into two categories: deoxyribonucleic acid (DNA) and ribonucleic acids (RNA). Nucleotides are the basic units of nucleic acid. A nucleotide is made up of the following elements: A phosphate is a phosphate group, and pentose sugar is a five-carbon sugar. The base is a heterocyclic nitrogen-containing molecule.

Lipids

Lipids are made up of carbon, hydrogen, and a small amount of oxygen. They are insoluble in water but dissolve in organic solvents such as ether, benzene, and acetone. Lipids aren't polymers; instead, they're made up of smaller molecules that have been dehydrated. Fatty acids or glycerol are examples of lipids (which is trihydroxy propane). Glycerol and fatty acids are found in many lipids. Phosphorus and phosphorylated chemical molecules are found in certain lipids. The structures of certain lipids are more complicated.

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Analysis of Biomolecules Chemical Composition

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The numerous biomolecules contained in living tissues (a vegetable or a chunk of liver, for example) may be investigated through chemical analysis. A thick slurry is created when live tissue is ground in trichloroacetic acid (Cl₃CCOOH). When you strain this slurry through cheesecloth or cotton, you get two fractions: the filtrate and the acid-soluble pool, which contains hundreds of organic molecules. Proteins, nucleic acids, polysaccharides, and other acid-insoluble substances are found in the retentate or acid-insoluble pool.

We will learn how to evaluate a living tissue sample and identify a specific chemical component in higher classes. In a nutshell, one extracts the compounds, then submits the extracts to a variety of separation processes until a compound is isolated from the other compounds. As a result, a chemical is isolated and purified. When the analytical approach is used on a chemical, it provides us an indication of the molecular formula and the substance's likely structure.

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Functions of Biomolecules

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DNA and RNA are nucleic acids, which have the unique task of storing an organism's genetic code—the sequence of nucleotides that determines the amino acid sequence of proteins, which are essential for life on Earth. A protein can include up to 20 different amino acids, and the order in which they appear is critical in determining the protein's structure and function. Proteins play a crucial role in the structure of cells. 

They also function as transporters for nutrients and other molecules into and out of cells, as well as enzymes and catalysts for the vast majority of chemical reactions in living organisms. Proteins have a role in the production of antibodies and hormones, as well as the control of gene activity.

Read more: Structure of DNA

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Structure of Biomolecules

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Carbohydrates are crucial energy sources and structural components of all life on Earth, and they are among the most prevalent biomolecules. They are made up of molecules containing carbon, hydrogen, and oxygen atoms. The four types of sugar units utilised to make them are monosaccharides, disaccharides, oligosaccharides, and polysaccharides.

Lipids, another important biomolecule in living organisms, provide a range of functions, including storing energy and functioning as chemical messengers. In higher (more sophisticated) species, they also create membranes that separate cells from their surroundings and compartmentalize the cell interior, giving birth to organelles like the nucleus and mitochondrion.

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Things to Remember

• Although living beings have a dizzying diversity, their chemical makeup and metabolic responses appear to be quite similar. When analysed qualitatively, the elemental makeup of live tissues and non-living substances appear to be comparable.
• Organic chemicals found in living organisms include amino acids, monosaccharide and disaccharide sugars, fatty acids, glycerol, nucleotides, nucleosides, and nitrogen bases. There are 20 different kinds of amino acids and five different kinds of nucleotides.
• Proteins, nucleic acids, and polysaccharides are the only macromolecules present in living systems. Lipids segregate in the macromolecular fraction due to their interaction with membranes.
• The building blocks of nucleic acids are nucleotides (RNA and DNA). Primary, secondary, tertiary, and quaternary structures exist in biomacromolecules. The genetic material is made up of nucleic acids.
• Enzymes are proteins that help cells catalyse biological processes. Ribozymes are nucleic acids that can catalyse reactions. Proteinaceous enzymes have substrate selectivity and require the right temperature and pH to function properly.