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AIPMT PRELIMS2004Chemistry-Biomolecules

AIPMT PRELIMS 2004 Chemistry Proteins MCQ Question

Type: MCQ-conceptual-Medium-Class 12

Which one of the following structures represents the peptide chain :-

A

−N∣H−C∣∣O−C∣∣−C∣∣−C∣∣−N∣H−C∣∣−C∣∣−C∣∣−-\overset{\text{H}}{\underset{|}{\text{N}}} - \underset{\substack{|| \\ \text{O}}}{\text{C}} - \overset{|}{\underset{|}{\text{C}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{\text{H}}{\underset{|}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{|}{\underset{|}{\text{C}}}-

B

−N∣H−C∣∣−C∣∣O−N∣H−C∣∣−C∣∣O−N∣H−C∣∣−CO∣∣−-\overset{\text{H}}{\underset{|}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \underset{\substack{|| \\ \text{O}}}{\text{C}} - \overset{\text{H}}{\underset{|}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \underset{\substack{|| \\ \text{O}}}{\text{C}} - \overset{\text{H}}{\underset{|}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{\substack{\text{O} \\ ||}}{\text{C}}-

C

−N∣H−C∣∣−CO∣∣−NH∣−C∣∣−N∣H−C∣∣O−C∣∣−C∣∣−-\overset{\text{H}}{\underset{|}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{\substack{\text{O} \\ ||}}{\text{C}} - \overset{|}{\underset{\text{H}}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \overset{\text{H}}{\underset{|}{\text{N}}} - \underset{\substack{|| \\ \text{O}}}{\text{C}} - \overset{|}{\underset{|}{\text{C}}} - \overset{|}{\underset{|}{\text{C}}}-

D

−N∣H−C∣∣O−NH∣−C∣∣−NH−CO∣∣−NH−-\overset{\text{H}}{\underset{|}{\text{N}}} - \underset{\substack{|| \\ \text{O}}}{\text{C}} - \overset{|}{\underset{\text{H}}{\text{N}}} - \overset{|}{\underset{|}{\text{C}}} - \text{NH} - \overset{\substack{\text{O} \\ ||}}{\text{C}} - \text{NH}-

Correct Answer

Option B

Detailed Explanation

A peptide chain is characterized by the presence of amide bonds (–CONH–) linking amino acids. Structure (3) shows this linkage.

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