NEET AIPMT SOLVED PAPER MAINS 2012

  • question_answer
    Which one of the following represents a palindromic sequence in DNA?               

    A)  5'-GAATTC-3 '3'-CTTAAG-3'   

    B)  5'CCAATG-3' 3'GAATCC-5'

    C)  5'-CATTAG-3 '3'-GATAAC-5'   

    D)  5'-GATACC-3' 3'-CCTAAG-5'

    Correct Answer: A

    Solution :

    In a palindrome, the base sequence in the second half of a DNA strand is the mirror image of sequence in first half. But in palindrome with rotational symmetry the base sequence in first half of one strand is mirror image of second half of complementary strand, e.g., 5'-G A A T T C-3' 3'-C T T A A G-5'


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