Punjab Medical Punjab - MET Solved Paper-2009

  • question_answer
    In \[{{C}_{3}}\] plants, the first stable product of photosynthesis during dark reaction is

    A) \[PGAL\]                             

    B) \[RuBP\]

    C) \[PGA\]                               

    D) \[OAA\]

    Correct Answer: C

    Solution :

    The\[{{C}_{3}}\]cycle begins with\[RuBP(5C)\]. Enzymes combine six\[RuBP\] molecules with \[C{{O}_{2}}\] from the atmosphere to form six molecules of an extremely unstable six carbon compound. This compound spontaneously reacts with water to form twelve moles of three carbon compound of phosphoglyceric acid\[(PGA)\], ie, the first stable compound.


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