Which functional groups in amino acids are directly involved in forming peptide bonds?

Correct option is A

The correct answer is: (A) Carboxyl and amino groups

Explanation:

• Peptide bonds form between the carboxyl group (-COOH) of one amino acid and the amino group (-NH₂) of another.
• This is a condensation reaction, where a water molecule is released, resulting in the formation of a –CO–NH– (amide) bond, which links the amino acids.

Information Booster:

• Peptide bonds are fundamental in forming proteins and polypeptides.
• The reaction is catalyzed in the ribosome during translation.
• This bond forms the primary structure of proteins.
• The bond has partial double-bond character, making it stable and rigid.
• The resulting chain has an N-terminus (amino end) and a C-terminus (carboxyl end).

Additional Information:

• Hydroxyl and sulfhydryl groups: Involved in hydrogen bonding or disulfide bonds, not peptide bonds.
• Carbonyl and phosphate groups: Involved in other biological molecules like ATP, not peptide bonding.
• Methyl and acetyl groups: Play a role in modification or side chain variation, not in peptide bond formation.