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

DNA helicase
Restriction endonuclease
DNA polymerase
DNA ligase

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Recombinant DNA
Agrobacterium tumefaciens is

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

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

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