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

  • question_answer
    Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at pH 1.0, which of the following species will predominate?

    A) \[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]  

    B) \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\]

    C) \[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}\]         

    D) \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HCO_{2}^{-}\]

    Correct Answer: A

    Solution :

    [a] In acidic medium Zwitter ion convert into \[\overset{+}{\mathop{N}}\,{{H}_{3}}-\underset{R}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-CO{{O}^{-}}+{{H}^{+}}\] \[\xrightarrow{{}}\overset{+}{\mathop{N}}\,{{H}_{3}}-\underset{R}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-COOH\]


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