Crown gall disease in plants is caused by

The most thoroughly studied of the known bacteria-plant interaction is the:

$A$ plasmid $DNA$ and a linear $DNA$ (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis,the plasmid shows one $DNA$ band while the linear $DNA$ shows two fragments. Explain.

In genetic engineering,two bacteria are very useful. They are ......

What are $amp^R$ and $tet^R$?

$DNA$ ligase is an enzyme that .......