Life cycle of a phage

Life cycle of a phage:

Phages show two different kinds of life cycle:

1. Virulent or lytic cycle

2. Temperate or lysogenic cycle.

Virulent or lytic cycle:

Intra cellular multiplication of the phage finishes in the lysis of the host bacterium and the discharge of progeny virions. The replication of a virulent phage occurs in the stages are: Adsorption, Penetration, Synthesis of phage components, Assembly, and Release of progeny phage particles.

Lysogenic cycle:

The temperate phages come into a symbiotic relationship with host cells. There is no death or lysis of host cells. Once within the host cell the temperate phage nucleic acid becomes integrated with bacterial genome. Presently the integrated phage nucleic acid is termed as prophage.

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