Cell Division: Mitosis and Meiosis · Zoology

Which regulatory protein complex controls progression through mitosis?

  1. Cyclin A with CDK2, active in S phase
  2. Cyclin B–CDK1
  3. Cyclin D with CDK4, active in G1
  4. Cyclin E with CDK2, at G1/S
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Correct answer: Cyclin B–CDK1

Cyclin B–CDK1 complex, also known as MPF, triggers entry into mitosis. Its activation initiates key mitotic events.

Difficulty: Medium Question 6 of 20

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