Q. Which one of the following represents a palindromic 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′
Explanation
[Solution from source] 5′–GAATTC–3′ reads the same 5′→3′ on both strands (the EcoRI site), which makes it a palindrome. In the other options the second strand does not read the same as the first in the 5′→3′ direction. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.