BIOL 103 Chapter Notes - Chapter 16: Lysogenic Cycle, Lytic Cycle, Viral Envelope

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When a virus infects a host cell; results in the production of new viruses: attachment. Virus attaches to surface of host cell; attachment usually specific for 1/few cells (virus proteins recognize cell membrane components: entry. One/several viral genes are expressed immediately b/c of action of host cell enzymes + ribosomes. Expression of key genes leads to step 3 or step 4 of virus reproductive cycle. Virus genome integrates into host cell --> step 2 to 3 (delaying production of new viruses) Step 3--> immediate production of new viruses: integration. Lysogenic cycle: dormancy; no new viruses made, host cell not destroyed. Viruses carry a gene for integrase; genen is expressed soon after entry and the enzyme is made. Viral genome copied from rna into complimentary dna, then uses dna strand as a template to make double-stranded viral dna w/ reverse transcriptase from the virus itself. Integrase cuts host"s dna and inserts viral dna into host dna.

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