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

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

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Recombinant DNA
The Southern blotting technique depends on

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

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