A Researcher Studying the Cell Cycle Observes a Sudden Increase

question 724

Multiple Choice

A researcher studying the cell cycle observes a sudden increase in the activity of several enzymes, including dihydrofolate reductase and DNA polymerase.  Which of the following processes most immediately precedes the observed increase in enzyme activity?

• A)Caspase enzyme cleavage
• B)GDP binding to Ras protein
• C)p27 protein upregulation
• D)Protein kinase A phosphorylation
• E)Retinoblastoma protein phosphorylation

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2/10

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