Recombinant DNA
Agrobacterium tumefaciens is

a fungi that is used to produce antibiotics in large amounts
a disease in humans that causes loss of weight
a bacterium that can be used to introduce DNA into plants
a disease in humans that causes loss of sight

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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
not producing any restriction endonucleases
methylating the DNA at the sites that the enzyme recognizes
having anti restriction endonucleases

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