The helix can be untwisted by the action of which type of topoisomerase?
A) Type I only
B) Type II only
C) Both types I and II
D) Topoisomerases cannot untwist the helix.

Question

Quizplus · Accepted Answer

Both Type I and Type II topoisomerases can untwist the helix. Type I topoisomerases work by making single-strand breaks to relieve supercoiling, while Type II topoisomerases, including DNA gyrase, make double-strand breaks to manage supercoiling and untangle DNA.

The Helix Can Be Untwisted by the Action of Which