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Essential Cell Biology

Biology

Quiz 18 :

The Cell-Division Cycle

Quiz 18 :

The Cell-Division Cycle

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A cell that is terminally differentiated will
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C

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Cells in the G0 state
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A

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The G1 DNA damage checkpoint
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D

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The Retinoblastoma (Rb) protein blocks cells from entering the cell cycle by
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Which of the following events does NOT usually occur during interphase?
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A mutant yeast strain stops proliferating when shifted from 25°C to 37°C.When these cells are analyzed at the two different temperatures, using a machine that sorts cells according to the amount of DNA they contain, the graphs in Figure 18-2 are obtained. img Figure 18-2 Which of the following would NOT explain the results with the mutant?
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MPF activity was discovered when cytoplasm from a Xenopus M-phase cell was injected into Xenopus oocytes, inducing the oocytes to form a mitotic spindle.In a control experiment, Xenopus interphase cytoplasm was injected into oocytes and shown not to induce the formation of a mitotic spindle.Which of the following statements is NOT a legitimate conclusion from the control experiment?
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Which of the following statements is FALSE?
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You have isolated a strain of mutant yeast cells that divides normally at 30°C but cannot enter M phase at 37°C.You have isolated its mitotic cyclin and mitotic Cdk and find that both proteins are produced and can form a normal M-Cdk complex at both temperatures.Which of the following temperature-sensitive mutations could NOT be responsible for the behavior of this strain of yeast?
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You engineer yeast cells that express the M cyclin during S phase by replacing the gene regulatory sequences of the M cyclin gene with those of the S cyclin gene.Keeping in mind that yeast cells have one common Cdk that binds to all cyclins, which of the following outcomes is LEAST likely during this experiment?
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Which of the following statements about the cell cycle is FALSE?
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Which of the following is NOT good direct evidence that the cell-cycle control system is conserved through billions of years of divergent evolution?
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Levels of Cdk activity change during the cell cycle, in part because
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Mitogens are
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Which of the following descriptions is consistent with the behavior of a cell that lacks a protein required for a checkpoint mechanism that operates in G2?
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Which of the following statements is FALSE?
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What would be the most obvious outcome of repeated cell cycles consisting of S phase and M phase only?
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Progression through the cell cycle requires a cyclin to bind to a Cdk because
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The concentration of mitotic cyclin (M cyclin)
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In which phase of the cell cycle do cells check to determine whether the DNA is fully and correctly replicated?
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