Exercise: Recombinant Dna

Questions for: Recombinant Dna

The advantage of using DNA polymerases from thermophilic organisms in PCR is that
A:
the DNA polymerases of these bacteria are much faster than those from other organisms
B:
the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands
C:
the DNA polymerases of these bacteria never make mistakes while replicating DNA
D:
all of the above
Answer: B
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An animal, that has gained new genetic information from the acquisition of foreign DNA, is considered as
A:
a chimera
B:
a transgenic animal
C:
a vector
D:
an enzyme that links DNA molecules
Answer: B
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The piece of equipment, that introduces DNA into cells via DNA-coated microprojectiles is known as
A:
laser
B:
DNA probe
C:
gene gun
D:
inoculating needle
Answer: C
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Which type of restriction endonuclease cuts the DNA within the recognition site?
A:
Type I
B:
Type II
C:
Type III
D:
All of the these
Answer: B
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Bacterial cells protect their own DNA from degradation by restriction endonucleases by
A:
methylating the DNA at the sites that the enzyme recognizes
B:
deleting all recognition sites from the genome
C:
not producing any restriction endonucleases
D:
having anti restriction endonucleases
Answer: A
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