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Phage. Definition. noun, plural: phages. (1) A bacteriophage: a virus capable of infecting a bacterial cell, and may cause lysis to its host cell. (2) A suffix that means a thing that eats or devours (as macrophage). Supplement. Bacteriophages or phages have a specific affinity for bacteria.
This association is called lysogeny, and the integrated phage DNA is referred to as a prophage (Figure 6-19). Under certain conditions, the prophage DNA is activated, leading to its excision from the host-cell chromosome and entrance into the lytic cycle. Bacterial viruses of this type are called temperate phages.ome bacterial viruses (bacteriophages) may undergo lysogeny following infection of host cells. In this case, the viral genome is integrated into host-cell chromosomes, forming a prophage that is replicated along with the host genome.