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EAMCET Medical EAMCET Medical Solved Paper-2005

  • question_answer
    Identify the correct sequence of enzymes given below which participate in the regeneration phase of Calvin cycle :
    1. Ribulose-5-phosphate isomerase
    2. Ribulose-5-phosphate epimerase
    3. Transketolase
    4. Triose phosphate isomerase
    The correct sequence is:

    A)  4, 1, 3, 2                                              

    B)  3, 4, 2, 1

    C)  4, 3, 1, 2                                              

    D)  2, 1, 4, 3

    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 ribuese -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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