Recombinant DNA
Problems in obtaining large amounts of proteins encoded by recombinant genes can often be overcome by using

all of these
YACS
expression vectors
BACS

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Recombinant DNA
Agrobacterium tumefaciens is

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

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

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

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