CELL DIVISION
CELL DIVISION AND CANCEROUS CELLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Detailed explanation-1: -A typical cyclin is present at low levels for most of the cycle, but increases strongly at the stage where it’s needed. M cyclin, for example, peaks dramatically at the transition from G 2start subscript, 2, end subscript to M phase.
Detailed explanation-2: -Explanation: They remain constant throughout cell cycle. 2. Which of the following statements regarding cyclins is not correct? Explanation: They activate cdk enzymes.
Detailed explanation-3: -Mitotic cyclins include types A and B. Type A cyclins appear in the S phase, are maximally expressed in G2, and decline in content by early metaphase. Type B cyclins appear in G2 and are maximally expressed in late G2 and M phases and disappear after metaphase, depending on the type of cyclin.
Detailed explanation-4: -Answer and Explanation: The false statement is d. the amount of CDKs changes during the cell cycle. In vertebrates, there are several types of cyclins and CDKs which actively participate in regulation of cell cycle in a stage-specific manner.