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

DNA probe
gene gun
inoculating needle
laser

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Recombinant DNA
The advantage of using DNA polymerases from thermophilic organisms in PCR is that

All of these
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
the DNA polymerases of these bacteria can withstand the high temperatures needed to denature the DNA strands

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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 sight
a disease in humans that causes loss of weight

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

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

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