Cyclin-dependent kinases (Cdk's) catalyze the phosphorylation of targeted proteins, a process that
a. decreases the mass of the protein.
b. makes the targeted proteins hydrophobic.
c. changes the shape and function of the targeted proteins.
d. gives the proteins a three-dimensional shape.
e. blocks the cell cycle from proceeding.
Answer: c. changes the shape and function of the targeted proteins.
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