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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, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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