Question

Identify the DNA segment which is not a palindromic sequence:

• A. 5' GAATTC 3' ;
  3' CTTAAG 5'
• B. 5' CCCGGG 3' ;
  3' GGGCCC 5'
• C. 5' GGATCC 3' ;
  3' GGRACC 5'
• D. 5' GCGGCCGC 3' ;
  3' CGCCGGCG 5'

Answer 1

The correct option is C 5' GGATCC 3' ;

3' GGRACC 5'

• The palindromic sequences are the sequences of the nucleotides which are the same when reading from either side.
• These are the sequences that are present on the DNA or RNA double helix.
• The sequence is the same when reading from 5' to 3' on one strand and 3' to 5' on the other. Option C not satisfying the same condition.

Thus, the correct answer is option C.