Viruses - Flynn Biology

Viruses - Flynn Biology

Viruses Dead or alive? Viral structure Viruses are not cells. Basic structure: Protein coat Nucleic acid core (RNA or DNA)

Lipoprotein coat (second coat only in enveloped viruses) Virus Categories DNA viruses stable, do not mutate rapidly Single-stranded or double-stranded Smallpox, Hepatitis B

RNA viruses mutate rapidly, unstable Single-stranded or double-stranded HIV, Rhinovirus Are viruses alive? Only

1 characteristic of life: reproduction Can only reproduce inside a host cell! Process or reproduction = lytic cycle Lytic Cycle Virus

attaches to host cells membrane and injects its nucleic acid into the host cell. The viral nucleic acid takes over protein synthesis, creating new viruses. The host cell bursts, lyses, releasing the newly formed viruses. Before attachment

Attachment Penetration and uncoating Release Assembly Replication

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