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

northern blotting
DNA replication
southern blotting
polymerase chain reaction

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

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

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