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

question 155

Multiple Choice

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

• A) Cdk1 and cyclin B.
• B) cyclin D and p21.
• C) cyclin A and Cdk2.
• D) phosphorylation of RB by Cdk4 and Cdk2.
• E) external signals from growth factors.

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