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describe the structure of protein (5 marks)
proteins are polymers of amino acids
joined by peptide bonds
formed by condensation reaction
primary structure is order of amino acids
secondary structure is folding of polypeptide chain into alpha helix and b- pleated sheet due to hydrogen bonding
tertiary structure is 3-D folding due to hydrogen bonding and ionic/disulphide bonds
quaternary structure is 2 or more polypeptide chains
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