Cell Growth and Organization

Question 9 • Health Science Concepts A1 – EDGNTY-83861 26-27

What is the role of CdKs?

Answer

to create enzymes that produce chemical changes

to signal the cell to move to the next phase of the cell cycle

to build structural components of DNA and energy-rich substances

to activate the cyclins that cause progression of the cell cycle

Explanation

CdKs (cyclin-dependent kinases) help regulate the cell cycle by phosphorylating target proteins when activated by cyclins. These signals move the cell forward into the next phase. Cyclins activate CdKs, not the other way around, so D reverses their roles.

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