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VMMC VMMC Medical Solved Paper-2010

  • question_answer
    Identify the correct sequence of enzymes given below which participate in the regeneration phase of Calvin cycle. I. Ribulose-5-phosphate isomerase II. Ribulose-5-phosphate epimerase III. Transketolase IV. Triose phosphate isomerase The correct sequence is

    A) IV, I, III, II            

    B)        III, IV, II, I            

    C)        IV, III, I, II            

    D)        II, I, IV, III

    Correct Answer: C

    Solution :

    Triose phosphate isomerase enzyme converts glyceraldehyde-3 phase molecule into dihydroxy acetone phosphate. Then after an enzyme transketolase comes which acts on sedoheptulose-7-phosphate molecule and changes it into ribulose-5-phosphate and xylulose-5-phosphate molecules of each. Then after ribulose-5-phosphate isomerase enzyme comes and acts on ribulose-5-phosphate. This reaction forms a molecule of ribulose-5 phosphate while xybulose-5-phosphate molecule is also converted into ribulose-5 phosphate by another enzyme, ribulose-5 phosphate epimerase.


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