Which of the Following Statements Is NOT True of the PRb

question 7

Multiple Choice

Which of the following statements is NOT true of the pRb protein?

• A)pRb is functionally inactive when it is hyperphosphorylated.
• B)pRb is mostly unphosphorylated during the G₀ phase of the cell cycle.
• C)pRb is growth-promoting during early G₁ phase.
• D)pRb phosphorylation is initiated by D-type cyclins and CDK4/6.
• E)pRb is functionally inactivated at the R point.

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