If a restriction enzyme cuts a circular DNA into three fragments, how many restriction sites are there in the DNA?
A) two
B) three
C) four
D) six
E) five

Question

Quizplus · Accepted Answer

A circular DNA cut into three fragments by a restriction enzyme indicates there are three restriction sites. Each cut creates a new fragment, so three cuts are needed to produce three fragments.

If a Restriction Enzyme Cuts a Circular DNA into Three