Bacteriophages are:

A) viruses that infect bacteria
B) plasmids that infect bacteria
C) bacteria that infect other bacteria
D) enzymes that destroy bacteria
E) recombinant organisms

Bacteriophages

Viruses that infect and replicate within bacteria, often used as tools in molecular biology and genetics.

Plasmids

Small, circular, double-stranded DNA molecules that are separate from a cell's chromosomal DNA and can replicate independently, often used in genetic engineering.

Recombinant Organisms

Organisms that have been genetically engineered by inserting DNA from a different organism to gain desired traits.