Multiple Choice
In control of the cell cycle, the G2 checkpoint prevents the cell cycle from continuing into mitosis until which condition is met?
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16. Cell Division
Control of the Cell Cycle
Multiple Choice
In the context of control of the eukaryotic cell cycle, what is MPF (maturation-promoting factor)?
A
A transcription factor that activates genes required for cytokinesis by binding promoter enhancers
B
A checkpoint protein that repairs DNA damage during S phase by excising mismatched bases
C
A protein kinase complex composed of cyclin and cyclin-dependent kinase (Cdk) that triggers the G2-to-M transition
D
An enzyme complex that degrades spindle microtubules to exit mitosis by depolymerization
Verified step by step guidance1
Understand that MPF stands for Maturation-Promoting Factor, which is crucial in regulating the eukaryotic cell cycle.
Recall that MPF is not a transcription factor or a DNA repair protein, but rather a protein complex involved in cell cycle progression.
Identify that MPF is composed of two main components: a cyclin protein and a cyclin-dependent kinase (Cdk).
Recognize that the primary role of MPF is to trigger the transition from the G2 phase to the M phase (mitosis) by phosphorylating target proteins.
Conclude that MPF functions as a protein kinase complex that activates processes necessary for mitosis, making the correct description: 'A protein kinase complex composed of cyclin and cyclin-dependent kinase (Cdk) that triggers the G2-to-M transition.'
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