Recombinant DNA
The piece of equipment, that introduces DNA into cells via DNA-coated microprojectiles is known as

inoculating needle
DNA probe
laser
gene gun

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

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

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