Cyclins

If cancer affects the cell cycle it will be that it has mutated the proteins that keep it tightly regulated. Whether or not it speeds up the individual cell phases of the cycle I do not know, but if the regulatory proteins are mutated to be permanently activated/"on" then it will proceed t...

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... a cancer cell compared to a normal cell? or does cancer just increase the number of times mitosis as a whole is performed? 2) Also, it seems that cyclins and cdks play a great role in cancer cells. From my understanding, the cyclin and/or cdk becomes defective and is used too much, causing mitosis ...

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you're right on the first one. On the second one i guess the answer they are expecting from you is CDKs(and their accompanying cyclins). I don't think they want you to name them, because they are different in different organisms.

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kinases and cyclins are probably the biggest influences on the transition from one stage of the cycle to the next. Although to be more specific, the kinases in question would be cyclin dependent kinases (CDKs).

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