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Proteins account for approximately half the organic molecules in living organisms.
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Proteins Proteins account for approximately half the organic molecules in living organisms. They are found in hair, nails and make up enzymes, antibodies, blood clotting agents and respiratory pigments (haemoglobin). In general proteins are large macromolecules containing carbon, hydrogen, oxygen and nitrogen. Proteins are polymers made up of monomers called amino acids. There are 20 different common amino acids found in living organisms. General formula: H H2N C COOH R The R group has a different structure for each of the 20 biologically important amino acids commonly found in organisms. The 20 amino acids can be sub divided into four groups according to the properties their R group possesses. non-polar - hydrophobic groups containing a lot of carbon and hydrogen polar - hydrophilic due to presence of partial charges which can form hydrogen bonds acidic - form negatively charged ions which are strongly hydrophilic basic - form positively charged ions which are also strongly hydrophilic. Individual amino acids in water also...
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