11. You may draw the following conclusions (true or false):

A. Substance X does not alter CDK4 levels in the immunocomplex but reduces its kinase activity.False CDK4 kinase activity is not affected by exposure to sbstance X.

B. Substance X does not affect CDK2 or CDK4 levels in the respective immunocomplexes. True

C. Substance X reduces the kinase activity of the CDK2 containing immunocomplex at
t=8-16. True

D. CDK2 kinase activity in control cells is lower at t=0-8 than at t=8-16. False You cannot compare the kinase activity at t=8 to that of t=16 because all assays are performed on cells that were harvested at t=16.