01:119:116 Lecture Notes - Lecture 1: Reverse Transcriptase, Binomial Nomenclature, Cell Membrane
24 Oct 2016
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Lytic cycle: phage replicative cycle that culminates in death of host cell. New phages lyse host"s cell wall releasing progeny. Phages that reproduce only by the lytic cycle are called virulent phage. Bacteria have defenses against phages, including restrictive enzymes that recognize and cut up certain phage dna: lysogenic cycle. Replicates the phage genome w/o destroying the host, interact w/ and actually integrate w. the host. The viral dna molecule is incorporated into the cell"s chromosome (prophage) Every time the host divides it copies the phage dna and passes the copies to daughter cells. Uv light, can trigger the virus genome to exit the bacterial chromosomes and switch to the lytic mode. Phages that use both the lytic and lysogenic cycles are called temperate phages: replicative cycles of animal viruses. There are 2 key variables used to classify viruses that infect animals.
