Recombinant DNA
The deliberate modifications of an organism's genetic information by directly changing its nucleic acid content is a subject matter of

genetic engineering
protein engineering
microbiology
population genetics

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

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