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Viruses

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

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Viruses

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  1. Viruses Dead or alive?

  2. Viral structure • Viruses are not cells. • Basic structure: • Protein coat • Nucleic acid core (RNA or DNA) • Lipoprotein coat • (second coat – only in enveloped viruses)

  3. 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

  4. Are viruses alive? • Only 1 characteristic of life: reproduction • Can only reproduce inside a host cell! • Process or reproduction = lytic cycle

  5. Lytic Cycle • Virus attaches to host cell’s 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.

  6. Before attachment Attachment Penetration and uncoating Release Assembly Replication

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