A) \[-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\mathop{\text{C}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ } \\ \text{H} \end{smallmatrix}}{\mathop{\text{C}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\text{NH}-\overset{\begin{smallmatrix} \text{O} \\ \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}\,-\text{NH}-\]
B) \[-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\mathop{\text{C}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\]
C) \[-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\mathop{\text{C}}}\,-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\mathop{\text{C}}}\,\]\[-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\mathop{\text{C}}}\,-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\]
D) \[-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\overset{\begin{smallmatrix} \text{H} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\overset{\begin{smallmatrix} \text{O} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{C}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ } \\ \text{H} \end{smallmatrix}}{\mathop{\text{N}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,\] \[-\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{N}}}\,-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\mathop{\text{C}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\underset{\text{ }\!\!|\!\!\text{ }}{\overset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}}\,-\]
Correct Answer: C
Solution :
The peptide linkage (?NH?CO?) is formed by the condensation of amino acids molecules. \[HNH-\underset{R}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-OH\] \[+\,H\cdot NH-\underset{R}{\mathop{\underset{\mathbf{|}}{\mathop{CH}}\,}}\,-\underset{O}{\mathop{\underset{|}{\mathop{C}}\,}}\,-OH\xrightarrow{{}}\] \[-HN-\underset{R}{\mathop{\underset{\mathbf{|}}{\mathop{CH}}\,}}\,-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-NH-\underset{R}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{O}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,-\] Hence, following structure represents the peptide chain. \[-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{O}{\mathop{\underset{|\,\,|}{\mathop{C}}\,}}\,-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\underset{O}{\mathop{\underset{|\,\,|}{\mathop{C}}\,}}\,-\overset{H}{\mathop{\overset{|}{\mathop{N}}\,}}\,-\underset{|}{\overset{|}{\mathop{C}}}\,-\overset{O}{\mathop{\overset{|\,\,|}{\mathop{C}}\,}}\,-\]
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