Multiple Choice
Which type of bond is responsible for holding amino acids together in a polypeptide chain?
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4. Protein Structure
Peptide Bond
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The reaction of amino acids to form a peptide bond involves which pair of functional groups?
A
Carboxyl group (\(-COOH\)) and phosphate group (\(-PO_4^{3-}\))
B
Hydroxyl group (\(-OH\)) and methyl group (\(-CH_3\))
C
Aldehyde group (\(-CHO\)) and sulfhydryl group (\(-SH\))
D
Amino group (\(-NH_2\)) and carboxyl group (\(-COOH\))
Verified step by step guidance1
Step 1: Understand the concept of peptide bond formation. A peptide bond is a covalent bond formed between two amino acids during protein synthesis. This bond is created through a condensation reaction, where water is removed.
Step 2: Identify the functional groups involved in amino acids. Amino acids contain two key functional groups: an amino group (
) and a carboxyl group (
). These groups are essential for peptide bond formation.
Step 3: Describe the reaction mechanism. During peptide bond formation, the carboxyl group (
) of one amino acid reacts with the amino group (
) of another amino acid. This reaction releases a molecule of water (
) and forms a peptide bond.
Step 4: Clarify why other functional groups are incorrect. The phosphate group (
), hydroxyl group (
), methyl group (
), aldehyde group (
), and sulfhydryl group (
) are not involved in peptide bond formation.
Step 5: Conclude that the correct functional groups involved in peptide bond formation are the amino group (
) and the carboxyl group (
).
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