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

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

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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 disease in humans that causes loss of sight
a bacterium that can be used to introduce DNA into plants

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Recombinant DNA
A genomic library is

a book that describes how to isolate DNA from a particular organism
a place where the information of the genetic organization of organisms are kept.
a collection of many clones possessing different DNA fragments from the same organisms bound to vectors
a database where the sequence of an organism's genome is stored

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