1 / 6

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

benjamin
Download Presentation

Viruses

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related