Multiple Choice
Which phase of the cell cycle is primarily responsible for the regulation of cell division?
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11. Cell Division
Cell Cycle Regulation
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What protein complex is primarily responsible for controlling the cell cycle at key checkpoints?
A
DNA polymerase
B
Cyclin-CDK complexes
C
Ribosomes
D
Histones
Verified step by step guidance1
Understand the role of the cell cycle: The cell cycle is a series of phases that a cell goes through to grow and divide. It includes phases such as G1, S, G2, and M, and is tightly regulated to ensure proper cell division.
Identify key checkpoints: The cell cycle has several checkpoints, such as the G1 checkpoint, G2 checkpoint, and the M checkpoint, which ensure that the cell is ready to proceed to the next phase.
Recognize the role of Cyclin-CDK complexes: Cyclin-dependent kinases (CDKs) are enzymes that, when combined with cyclins, form Cyclin-CDK complexes. These complexes are crucial for the progression of the cell cycle through its checkpoints.
Differentiate between the options: DNA polymerase is involved in DNA replication, ribosomes are involved in protein synthesis, and histones are proteins that package DNA. None of these directly control the cell cycle checkpoints.
Conclude that Cyclin-CDK complexes are the primary regulators of the cell cycle at key checkpoints, ensuring that the cell cycle progresses only when conditions are favorable.
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