The bond that joins two amino acids in a polypeptide chain forms between
Correct answer: B. the carboxyl group of one amino acid and the amino group of the next
- 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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About Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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