A peptide bond forms between
Athe carboxyl of one and amino of the next
Bthe R groups of two adjacent amino acids
Ctwo amino groups on adjacent amino acids
Dtwo carboxyl groups on adjacent amino acids
Answer & Solution
Correct answer: A. the carboxyl of one and amino of the next
A peptide bond forms when the carboxyl group of one amino acid reacts with the amino group of the next, releasing water (a condensation reaction). R groups give amino acids their identity but don't form the backbone. Two of the same group cannot join because the chemistry needs an acid + base pair.
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