Recombinant Technology

Answer (a) Plasmid

Biolistics technique also known as ballistic method of DNA delivery has general applicability to plant species and can be used to deliver DNA into virtually all tissues.

In bacteria, restriction endonucleases function to defend the cell against invading viral bacteriophages.

Answer (c) Agrobacterium tumefaciens

Answer (b) Biolistic method

During the transfer of genes in rDNA technology, the gene which is modified has to be taken up by the host cells. Many methods are used to transfer the modified genes into the host cell. One such method is the biolistic or gene gun method, which is suitable for plant cells. In this method, tiny metal balls (like micro-particles of gold or tungsten) coated with the recombinant gene are propelled into the plant cell at high velocity.