Multiple Choice
The cell cycle stages follow one another in a normal sequence due to the correct ______.
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16. Cell Division
Control of the Cell Cycle
Multiple Choice
In eukaryotic cells, what molecular system primarily controls progression through the cell cycle at key checkpoints (e.g., G1/S and G2/M)?
A
Cyclin-dependent kinases (CDKs) activated by binding specific cyclins
B
Ribosomes increasing global protein synthesis to trigger phase transitions
C
Aquaporin channels regulating water flux to signal entry into mitosis
D
Telomerase activity directly initiating checkpoint passage by elongating telomeres each cycle
Verified step by step guidance1
Understand that the cell cycle is regulated by specific molecular mechanisms that ensure proper progression through its phases, especially at key checkpoints like G1/S and G2/M.
Recognize that cyclin-dependent kinases (CDKs) are enzymes whose activity is essential for driving the cell cycle forward by phosphorylating target proteins.
Know that CDKs require binding to regulatory proteins called cyclins, which fluctuate in concentration during the cell cycle, to become activated.
Identify that the combination of specific cyclins with their corresponding CDKs at checkpoints controls whether the cell proceeds to the next phase, ensuring proper timing and conditions.
Eliminate other options by understanding their roles: ribosomes increase protein synthesis but do not directly control checkpoints; aquaporins regulate water flow but are unrelated to cell cycle control; telomerase maintains telomeres but does not directly trigger checkpoint passage.
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