The bond that joins two amino acids in a polypeptide chain forms between
- A. two amino groups
- B. the carboxyl group of one amino acid and the amino group of the next
- C. two R groups
- D. the carboxyl group of one amino acid and the R group of the next
Explanation
A peptide bond is a condensation between the carboxyl group of one amino acid and the alpha amino group of the next, releasing water. The R groups stay free and determine how the chain folds and what the protein does. Interactions between R groups matter at the tertiary level, but they are not peptide bonds.
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