The first four nucleotides of an eight-nucleotide restriction enzyme recognition sequence are CTGA.What are the next four, if the restriction enzyme recognizes the same sequence motif on both strands? (Note: Only the coding strand is shown.)

Question

Quizplus · Accepted Answer

The recognition sequence is symmetrical, meaning it is the same when read in either direction. Therefore, the next four nucleotides on the complementary strand, read in the opposite direction, would be GACT. The answer choice that matches this is D) TCAG.

The First Four Nucleotides of an Eight-Nucleotide Restriction Enzyme Recognition