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

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

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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 are much faster than those from other organisms
the DNA polymerases of these bacteria never make mistakes while replicating DNA
All of these
the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands

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