1. Proteins have a ‘backbone’ of repeating elements, based on the similar composition of amino acids. The repeating elements of a polypeptide backbone are: a. S-C-C-S-C-C… b. N-C-C-N-C-C… c. N-C-O-N-C-O… d. C-O-O-C-O-O… e. C-P-C-C-P-C… I dont get this question? Help me
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