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Write an essay on the functions of proteins in plants and animals Proteins are polymers of monomers called amino acids. Amino acids contain hydrogen, carbon, oxygen and nitrogen. When amino acids are linked together, they form polypeptide chains and bonded together by peptide bonds. There are different structures of polypeptides primary, secondary, tertiary and quaternary. The primary structure is a straight chain of polypeptides. Secondary structure is the polypeptide chain coiling to form an ? helix or the polypeptide chain linking together to form a ß pleated strand. In an ? helix hydrogen bonding forms in the secondary structure between the NH group of one amino acid and the CO group of another amino acid. In a ß pleated strand hydrogen bonding occurs between the CO and NH groups of one amino acid residue of one chain and the NH and CO group of another chain. The further folding of the...

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