Bt gene from bacteria can kill insects.

Using recombinant DNA technology, genes from a donor cell can be inserted into a bacterium for DNA replication and protein synthesis. The kind of cells that can be used as gene donors in this technology are

Crystals of Bt toxin produced by some bacteria do not kill the Bacteria them. (a) bacteria are residant to the toxin (b) toxin is immature, © toxin is inactive, (d) bacteria encloses toxin in a special sac.

Bt toxin gene has been cloned from the bacteria and expresed in plants to provide resistance to insects without the need for insecticides. Exampleso of such plants are

What does Bt mean in biotechnology? How Bt toXIIn kills insects?

in case of Bt cotton, how does the toxic insecticide protein produced by the bacterium kills the insect pest but not the cell of Bacillus thuringiensis where the toxic protein is generated?

Endosymbiotic hypothesis says that chloroplasts evolved from bacteria. Substantiate the statement.

Statement I : Interferons are proteinaceous, antibacterial and species specific substance product by mammalian cells when injected with bacteria. Statement II : Interferons and Human blood clotting factor VIII can be isolated from blood but with same risk.

You are provided with the mixture of transformed bacteria having recom-binant plasmids in which a foreign DNA is linked at the sits of tetracy- cline resistance and non transformed bacteria . How will you select the recombinant plasmids from the mixture ?