Recombinant DNA
A molecular technique in which DNA sequences between two oligonucleotide primers can be amplified is known as

DNA replication
southern blotting
northern blotting
polymerase chain reaction

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Recombinant DNA
Bacterial cells protect their own DNA from degradation by restriction endonucleases by

methylating the DNA at the sites that the enzyme recognizes
deleting all recognition sites from the genome
not producing any restriction endonucleases
having anti restriction endonucleases

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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
the DNA polymerases of these bacteria are much faster than those from other organisms
All of these
the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands

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Recombinant DNA
Agrobacterium tumefaciens is

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

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