Recombinant DNA
Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are

helicases
restriction endonucleases
DNA gyrase
DNA ligase

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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 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
All of these
the DNA polymerases of these bacteria never make mistakes while replicating DNA

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Recombinant DNA
Agrobacterium tumefaciens is

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

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Recombinant DNA
The Southern blotting technique depends on

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

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