1.

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]

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.                 \[-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\]
Answer» B.                 \[-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-\underset{H}{\mathop{\underset{|}{\mathop{N}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\]


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