Which sequence is a palindromic recognition sequence?
A) 5ʹ-CAATTG-3ʹ
B) 5ʹ-CAATAG-3ʹ
C) 5ʹ-CATTTG-3ʹ
D) 5ʹ-GATTTC-3ʹ
E) 5ʹ-CATCAT-3ʹ

Question

Quizplus · Accepted Answer

A palindromic recognition sequence is a sequence of DNA where the 5ʹ to 3ʹ sequence is the same on both strands. For option A, 5ʹ-CAATTG-3ʹ on one strand pairs with 3ʹ-GTTAAC-5ʹ on the complementary strand, which reads the same (CAATTG) when flipped to align the 5ʹ to 3ʹ direction, making it palindromic.

Which Sequence Is a Palindromic Recognition Sequence