Recombinant DNA
Which of the following enzyme is used to covalently bond foreign DNA to a vector plasmid?

DNA helicase
Restriction endonuclease
DNA ligase
DNA polymerase

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Recombinant DNA
The advantage of using DNA polymerases from thermophilic organisms in PCR is that

the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands
All of these
the DNA polymerases of these bacteria never make mistakes while replicating DNA
the DNA polymerases of these bacteria are much faster than those from other organisms

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Recombinant DNA
Agrobacterium tumefaciens is

a bacterium that can be used to introduce DNA into plants
a disease in humans that causes loss of sight
a disease in humans that causes loss of weight
a fungi that is used to produce antibiotics in large amounts

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Recombinant DNA
The Southern blotting technique depends on

similarities between the sequences of probe protein and experimental protein
similarities between the sequences of probe DNA and experimental DNA
the molecular mass of proteins
similarities between the sequences of probe RNA and experimental RNA

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