3. Why are yeast cells frequently used as hosts for cloning? (A) They easily form colonies. (B) They can remove exons from mRNA. (C) They do not have plasmids. (D) They are eukaryotic cells. (E) Only yeast cells allow the gene to be cloned.

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

3. Why are yeast cells frequently used as hosts for cloning?
(A) They easily form colonies.
(B) They can remove exons from mRNA.
(C) They do not have plasmids.
(D) They are eukaryotic cells.
(E) Only yeast cells allow the gene to be cloned.

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