Skip to main content
We’re so back. See what’s new for the 2026-2027 school year →
The new Teacher Workspace is here. Your first 3 assignments are free. Try it →

🧬ap biology review

Topoisomerase in AP Biology

Written by the Fiveable Content Team
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team

Definition

Topoisomerase is an enzyme that alters the supercoiled form of a DNA molecule. It helps in unwinding the DNA helix by cutting one or both strands, allowing it to unwind and then resealing it.

AP course connection

Topic 6.2: 6.2 DNA Replication

Unit 6

Keep studying

Review this concept in 6.2 DNA ReplicationAP Biology course hub

Topoisomerase cheat sheet for homework

visual study aid

"Topoisomerase" also found in:

Keep studying AP Biology

Connect this key term to the AP exam workflow: review the course, practice questions, and check related study tools.

AP Biology hub

Review units, study guides, and course resources.

AP-style practice

Check this vocabulary in multiple-choice context.

FRQ practice

Apply key concepts in written AP responses.

Score calculator

Estimate the exam score you are working toward.

Cheatsheets

Review the highest-yield facts before practice.

Practice exam

Put the full course together before test day.