Recombinant DNA
What is the normal role of restriction endonucleases in bacterial cells?

To degrade the bacterial chromosome into small pieces during replication
All of these
To degrade invading phage DNA
To produce RNA primers for replication

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Recombinant DNA
The Southern blotting technique depends on

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
similarities between the sequences of probe DNA and experimental DNA

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