Regulation of the Cell Cycle Is Dependent on Cyclins and Cyclin-Dependent

question 59

Multiple Choice

Regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases.The key that allows a cell to progress beyond the restriction point is

• A) the presence of cyclin.
• B) the absence of cyclin.
• C) the presence of cyclin and Cdk.
• D) phosphorylation of RB by Cdk.
• E) the presence of external signals from growth factors.

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