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Question
Which of the following about Rb tumor suppressor protein is correct?
Options:
A .  It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received
B .  It is activated when phosphorylated by Cdk
C .  It is a transcription factor
D .  When a mitogenic signal is received, it binds the transcription factor E2F and thus stimulates the cell to enter S phase
Answer: Option A
Answer: (a).It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received

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