RAJASTHAN ­ PET Rajasthan PET Solved Paper-2007

  • question_answer
    Which bond is presents in protein and peptides?

    A)  \[-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-NH-\]

    B)  \[-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-O-\]

    C)  \[-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-O-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-\]

    D)  \[-NH-\]

    Correct Answer: A

    Solution :

     Protein and peptides form by the addition of amino acids. \[N{{H}_{2}}-\underset{\begin{smallmatrix}  | \\  H \end{smallmatrix}}{\overset{\begin{smallmatrix}  R \\  | \end{smallmatrix}}{\mathop{C}}}\,-COOH+N{{H}_{2}}-\overset{\begin{smallmatrix}  R \\  | \end{smallmatrix}}{\mathop{CH}}\,-COOH\] \[\xrightarrow[-{{H}_{2}}O]{{}}\underset{dipeptide}{\mathop{N{{H}_{2}}-\overset{\begin{smallmatrix}  R \\  | \end{smallmatrix}}{\mathop{CH}}\,-CO-NH-\overset{\begin{smallmatrix}  R \\  | \end{smallmatrix}}{\mathop{CH}}\,-COOH}}\,\] Hence, protein and peptides contain peptide linkage, ie, \[-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-NH-\]


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