Recombinant DNA
Charged molecules are separated based on varying rates of migration through a solid matrix when subjected to an electric field. This technique is known as

autoradiography
photoreactivation
gel electrophoresis
blotting

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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 fungi that is used to produce antibiotics in large amounts
a disease in humans that causes loss of sight
a disease in humans that causes loss of weight

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