13. Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active? (A) PDGF (B) MPF (C) protein kinase (D) cyclin (E) Cdk

16. A principal problem with inserting an unmodified mammalian gene into a plasmid and then getting that gene expressed in bacteria is that _____. (A) bacteria translate only mRNAs that have multiple messages (B) prokaryotes use a different genetic code from that of eukaryotes (C) bacteria cannot remove eukaryotic introns (D) bacterial RNA polymerase cannot make RNA complementary to mammalian DNA

13. Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?
(A) PDGF
(B) MPF
(C) protein kinase
(D) cyclin
(E) Cdk

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