In order to get around the lack of ability of prokaryotes to remove introns from precursor RNA, it may be necessary to
A. use the DNA directly.
B. use the DNA after it has been processed.
C. use different promoters.
D. turn mRNA into cDNA.
E. use the DNA directly AND use the DNA after it has been processed.
When a vector that employs the lacZ gene as a second marker is used in a cloning experiment, bacteria that harbor the recombinant DNA will give rise to
A. red colonies.
B. white colonies.
C. blue colonies.
D. All of the choices are correct.
A danger in using E. coli in cloning is that
A. E. coli could cause disease.
B. the human cells may reject the insertion.
C. the exons may invert the introns.
D.
the outer membrane is toxic to humans.
Laboratory strains of E. coli are desirable hosts because
A. it is easy to grow.
B. its genetics is well known.
C. it is especially able to express foreign genes.
D. it has known phenotypic characteristics.
E. All of the choices are correct.
Host cells containing recombinant DNA can be selected on the basis of the properties of the
A. vector.
B. ribosomes.
C. enzymes.
D. virus.
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