Rb plays an important role in regulating the cell cycle. What is the function of the protein Rb? In the absence of DNA damage.

Question

Rb plays an important role in regulating the cell cycle. What is the function of the protein Rb?
In the absence of DNA damage. Rb activates transcription and triggers the G₁/S transition.
In the presence of DNA damage, Rb activates DNA repair mechanisms.
In the absence of mitogenic signals. Rb inhibits transcription and blocks the cell cycle.
In the presence of mitogenic signals, Rb binds and activates G₁-Cdk

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