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BHU PMT BHU PMT (Screening) Solved Paper-2010

  • question_answer
    In his experiment, Mendel obtained wrinkled pea. The wrinkling was due to deposition of sugar instead of starch. This happened due to the enzyme

    A)  amylase

    B)  invertase

    C)  diastase

    D)  absence of starch-branching enzyme

    Correct Answer: D

    Solution :

                     In round seeds (RR/Rr), starch-branching enzyme (\[\text{SBE-1}\]) is found but is absent from wrinkled seeds. In rr seeds, a small DNA segment interferes with \[\text{SBE-1}\] activity so that starch is not formed and free sugar gets accumulated. Resulting high osmotic pressure in rr seeds leads to shrinkage and wrinkling.


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