Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?
A) PDGF
B) MPF
C) protein kinase
D) cyclin
E) Cdk

Question

Quizplus · Accepted Answer

MPF, or mitosis-promoting factor, triggers the cell's passage past the G2 checkpoint and into mitosis. MPF is composed of cyclin and Cdk, and its activity is regulated by various checkpoints in the cell cycle, including the G2 checkpoint. Therefore, choices D and E (cyclin and Cdk) are also involved in this process, but the best choice is B, which encompasses both of these components as part of the MPF complex. PDGF (A) and protein kinase (C) are not directly involved in triggering the passage of the G2 checkpoint into mitosis.

Which of the Following Triggers the Cell's Passage Past the G2