Question

Which one of the following represents apalindromic sequence in DNA?

(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'

Answer 1

(a) 5' - GAATTC - 3'

3' - CTTAAG - 5'

Explanation:

A palindromic sequence is a nucleic acid sequence (DNA or RNA) that is the same whether read 5' (five-prime) to 3' (three prime) on one strand or 5' to 3' on the complementary strand with which it forms a double helix.

5 - GAATTC - 3

3 - CTTAAG - 5

It is a palindromic sequence of DNA cut by restriction enzyme EcoRI.