Which is a mechanical vector that injects recombinant DNA directly into the nucleus of a host cell?

a. gene gun

b. micropipette

c. bacterial plasmid

d. viral phage

The mechanical vector that injects recombinant DNA directly into the nucleus of a host cell is a gene gun. A vector transports pathogens to the susceptible individual without any biologic development. On the other hand, the bacterial plasmid is a biological vector.

The answer to your question is letter A.