CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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G1:ensure cells are resting
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G2:ensures the DNA is copied
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M ensures the cells are the right size
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none of the above are correct
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Detailed explanation-1: -The G2 checkpoint ensures all of the chromosomes have been replicated and that the replicated DNA is not damaged before cell enters mitosis. The M checkpoint determines whether all the sister chromatids are correctly attached to the spindle microtubules before the cell enters the irreversible anaphase stage.
Detailed explanation-2: -The G2/M checkpoint prevents DNA-damaged cells from entering mitosis and allows for the repair of DNA that was damaged in late S or G2 phases prior to mitosis.
Detailed explanation-3: -The G2-phase checkpoint, also known as G2/M-phase checkpoint, has the function of preventing cells with damaged DNA, lasting from the G1 and S phases or generated in G2, from undergoing mitosis. The mechanisms acting during the G2-phase checkpoint converge on the inhibition of the mitotic complex CDK1-cyclin B.
Detailed explanation-4: -G2 checkpoint is near the end of G2 (close to the G2/M transition). Spindle checkpoint is partway through M phase, and more specifically, at the metaphase/anaphase transition.
Detailed explanation-5: -Which description below explains the G2 checkpoint? Ensures that all of the chromosomes have been replicated and that the replicated DNA is not damaged. The cell cycle is halted if the checkpoint mechanisms detect problems with the DNA and will either complete DNA replication or repair the damaged DNA.