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

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

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Recombinant DNA
The Southern blotting technique depends on

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

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Recombinant DNA
Vectors are

molecules that help in replication
molecules that protect host cells from invasion by foreign DNA
molecules that are able to covalently bond to and carry foreign DNA into cells
molecules that degrade nucleic acids

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