Q104 / 120 · NEET 2012 (Mains) · Zoology

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

  • Correct answer
    A
    5'-GAATTC-3' 3'-CTTAAG-5'
  • B
    5'CCAATG-3' 3'GAATCC-5'
  • C
    5'-CATTAG-3' 3'-GATAAC-5'
  • D
    5'-GATACC-3' 3'-CCTAAG-5'

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 immage of second half of complementary strand, e.g., 5'-G A A T T C-3 3-C T T A A G-5

Hence, the correct answer is option: 'A'.

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