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State whether the following is true or false.
Different cyclins act at different points in the cell cycle.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

Cyclin D operates in G1, cyclin E at the G1 to S transition, cyclin A during S and cyclin B at mitosis. Their successive appearance is what gives the cycle its ordered sequence. Substituting one for another would disrupt the order of events.

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