Q. Which one of the following structure represents the peptide chain?

A) [image:14_image3.emf]
B) [image:14_image4.emf]
C) [image:14_image5.emf]
D) [image:14_image6.emf]
Explanation

(c)
The peptide linkage $( - NH - CO - )$ is formed by the condensation of amino acids molecules.
$HNH - CH - C - OH + H\ .NH - CH - C - OH\ \ \$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \parallel$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ R\ \ \ \ \ \ \ \ O\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ R\ \ \ \ \ \ \ \ \ \ O$
$\overset{\rightarrow}{\ \ \ \ - H_{2}O\ \ \ \ \ } - HN - CH - C - NH - CH - C -$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \ \parallel$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ R\ \ \ \ \ \ \ \ O\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ R\ \ \ \ \ \ \ \ \ \ \ O$
Hence, following structure represents the peptide chain.
$\ \ \ H\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ H\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ H\ \ \ \ \ \ \ \ \ \ \ \ \ O$
$\ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ |\ \ \ \ \parallel$
$- N - C - C - N - C - C - N - C - C -$
$\ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ O\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ O$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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