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NEET AIPMT SOLVED PAPER 2001

  • 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 (SBE-I) is found but is absent from wrinkled seeds. In rr seeds, a small DNA segment interferes with 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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