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7 / 19  Which protein is a positive regulator that phosphorylates other proteins when activated?
A  p53
B  retinoblastoma protein (Rb)
C  cyclin
D  cyclin-dependent kinase (Cdk)

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Source:  OpenStax, Ap biology - part 1: the cell. OpenStax CNX. Oct 02, 2014 Download for free at https://legacy.cnx.org/content/col11711/1.1
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