What Causes the Rhythmic Change in Cyclin Concentration in the Cell

question 21

Multiple Choice

What causes the rhythmic change in cyclin concentration in the cell cycle?

• A) Its destruction by an enzyme phosphorylated by the cyclin- Cdk complex
• B) An increase in production of a Cdk once the restriction point is passed
• C) The binding of PDGF to receptors on the cell surface
• D) The changing ratio of cytoplasm to genome
• E) The cascade of increased production once the protein is phosphorylated by Cdk

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