Recombinant DNA
Which of the following enzyme is used to covalently bond foreign DNA to a vector plasmid?

Restriction endonuclease
DNA ligase
DNA helicase
DNA polymerase

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

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

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