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NEET Chemistry Biomolecules / जैव-अणु Question Bank Self Evaluation Test - Biomolecules

  • question_answer
    The \[p{{K}_{4}}\] values for the three ionizable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively \[\underset{X}{\mathop{H{{O}_{2}}C}}\,-C{{H}_{2}}-\underset{Y}{\mathop{\underset{_{+}N{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H}}\,-\underset{Z}{\mathop{C{{O}_{2}}H}}\,\] The isoelectric point for the amino acid is:

    A) 7.00                 

    B) 3.25  

    C) 4.95                 

    D) 5.95

    Correct Answer: B

    Solution :

    [b] In acidic medium \[\frac{4.3+2.2}{2}~=3.25\]


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