Suppose a long sequence of DNA is cut with four different restriction enzymes. Which restriction enzyme should produce the fewest number of fragments?
A) One that cuts at the sequence GACT
B) One that cuts at the sequence GCCTCT
C) One that cuts at the sequence AGTTCTAT
D) One that cuts at the sequence CAGTTCTATG
E) Each of these enzymes should produce roughly the same number of fragments.

Question

Quizplus · Accepted Answer

The longer the recognition sequence of a restriction enzyme, the less frequently it will occur in a DNA sequence, resulting in fewer fragments. The enzyme that cuts at the sequence CAGTTCTATG has the longest recognition sequence, so it should produce the fewest fragments.

Suppose a Long Sequence of DNA Is Cut with Four