Biomolecules Question 157
Question: Which one of the following structures represents the peptide chain
[CBSE PMT 2004; CPMT 2003; DCE 2002; MP PET 1994; Bihar MEE 1997; Orissa JEE 1997]
Options:
A) $ -\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}}}-\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}}}-\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}}}- $
B) $ -\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}}}-\underset{H}{\mathop{\underset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}-\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}- $
C) $ -\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}}}-\underset{H}{\mathop{\underset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-NH-\overset{O}{\mathop{\overset{||}{\mathop{C}}}}-NH- $
D) $ -\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}-\overset{H}{\mathop{\overset{|}{\mathop{N}}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}-\underset{|}{\overset{|}{\mathop{C}}}- $
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Answer:
Correct Answer: A
Solution:
In peptide linkage i.e., -CONH - group, the carboxyl group of one amino acid molecules forms an amide by combination with the amino group of the next amino acid molecule with the liberation of water molecule.
BETA
