Question

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

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

Answer 1

The correct option is D 5'-GAATTC-3'

3'-CTTAAG-5'

In dsDNA, the sequence of nucleotides in one chain is same as in the opposite chain, is called palindromic sequence and the region with palindromic sequence is called palindrome.

In one chain of DNA GAATTC is present in 5’ to 3’ direction, same sequence is found in opposite chain.

so, the correct option is 5’GAATTC 3’

3’ CTTAAG5’