NEET Biology NEET PYQ-Chemical Coordination

  • question_answer
    Which one of the following is not a second messenger in hormone action? [AIPMT (S) 2006]

    A) GMP

    B) Calcium

    C) Sodium

    D) AMP

    Correct Answer: D

    Solution :

    [D] Second messengers are the organic molecules and sometimes the metal ions, acting as intracellular signals, whose production or release usually amplifies a signal such as a hormone, received at the cell surface. Sodium (Na) is not a second messenger in hormone action. Cyclic Adenosine Monophosphate (cAMP) was the first “second messenger” to be discovered. In addition to cyclic AMP, Cyclic Guanosine Monophosphate (cGMP) functions as a second messenger in certain cases. Calcium ions (Ca2+) also act as second messenger in phospholipase C-Ca+ second messenger system.


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