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Question

Which of the following is a palindromic sequence?
  1. 5’-CGTATG-3’
    3’-GCATAC-5'
  2. 5’-GAATTC-3’
    3’-CTTAAG-5’
  3. 5’-GACTAC-3’
    3’-TACGAC-5'
  4. 5’-CGAATG-3’
    3’-CGAATG-5’


Solution

The correct option is B 5’-GAATTC-3’
3’-CTTAAG-5’
Palindromic sequences are recognition sequences that are present in a double stranded DNA, which read the same when read from left to right in one strand and right to left in the other. 

The direction of the read will be 5' to 3' in both the strands.

Example:
5’-GAATTC-3’
3’-CTTAAG-5’

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