JEE Main & Advanced Chemistry Biomolecules / जैव-अणु Question Bank Proteins, Amino Acids and Enzymes

  • question_answer
    Amino acids usually exist in the form of Zwitter ions. This means that it consists of            [KCET 2000]

    A)                 The basic group \[N{{H}_{2}}\] and the acidic group \[-COOH\]

    B)                 The basic group \[-NH_{3}^{+}\] and the acidic group \[-C{{O}_{2}}\]

    C)                 The basic group \[-CO_{2}^{-}\] and the acidic group \[NH_{3}^{+}\]

    D)                 No acidic or basic group

    Correct Answer: C

    Solution :

               Zwitter ion is a dipolar ion containing both a positive and negative charge in the following form \[\underset{\text{Zwitter ion}}{\mathop{R-\overset{\overset{NH_{3}^{+}}{\mathop{|\,\,\,\,\,\,\,}}\,}{\mathop{CH\,\,\,}}\,-CO{{O}^{-}}\,}}\,\]                                 The basic group \[\,CO_{2}^{-}\] and acidic group \[\,NH_{3}^{+}\].


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