Apentix/AP Biology/Unit 4: Cell Communication and Cell Cycle/Question
AP Biologymediummcq1 pt

Which statement about the cell cycle's control system is correct?

A.Cyclin–Cdk complexes act as molecular switches
B.Cyclins are destroyed at the start of M phase only
C.Cdks work without cyclins
D.The cycle needs no checkpoints

Explanation

Core Concept

Rising cyclin levels activate Cdks at the right moments; cyclin destruction inactivates them — a clockwork of on/off switches gating each transition.

Correct Answer

ACyclin–Cdk complexes act as molecular switches

More Unit 4: Cell Communication and Cell Cycle practice questions

Try a random question →

Practice more AP Biology questions with full explanations

Practice Unit 4: Cell Communication and Cell Cycle Questions →