Which Statement Concerning Cyclins Is NOT Correct

Multiple Choice

Which statement concerning cyclins is NOT correct?

A) They are activated and degraded during the cell cycle.
B) They are regulatory subunits for enzymes that catalyze the phosphorylation of proteins.
C) They can become linked to ubiquitin.
D) They catalyze the phosphorylation of proteins.
E) They contain specific amino acid sequences that target them for proteolysis.