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

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

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

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Recombinant DNA
Vectors are

molecules that protect host cells from invasion by foreign DNA
molecules that help in replication
molecules that are able to covalently bond to and carry foreign DNA into cells
molecules that degrade nucleic acids

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Recombinant DNA
A genomic library is

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

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Recombinant DNA
Agrobacterium tumefaciens is

a bacterium that can be used to introduce DNA into plants
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

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