Each of the twenty standard amino acids differs from all the others in

A. the structure of its amino group
B. the nature of its R group
C. the structure of its carboxyl group
D. the number of peptide bonds it can form

Explanation

Every amino acid shares the same amino group, carboxyl group and central carbon, so only the variable R group distinguishes one from another and gives it its chemical character. This is why the R group, not the backbone, determines where an amino acid sits in a folded protein.

Each of the twenty standard amino acids differs from all the others in

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