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The Virus. Engage. Ebola: The Plague Fighters Pathogens – How are they transmitted. Explore. TMV – Tobacco Mosaic Virus Models of Viruses. What is a Virus?. Virus Latin for Poison Non-cellular particle with DNA or RNA 1 or 2 Protein Coats (Capsids)

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Presentation Transcript
  • Ebola: The Plague Fighters
  • Pathogens – How are they transmitted
  • TMV – Tobacco Mosaic Virus
  • Models of Viruses
what is a virus
What is a Virus?
  • Virus Latin for Poison
  • Non-cellular particle with
    • DNA or RNA
    • 1 or 2 Protein Coats (Capsids)
    • May have Viral Envelope - Phospholipids
  • DO NOT respire or grow
  • ONLY function in a living cell
  • NOT given Latin names like living organisms

(rabies virus) (polio virus)

(adenovirus=adenoid tissue)

questions discussion
  • Do Viruses Respire?
  • What type of genetic material do viruses have?
  • Can they have both DNA and RNA?
how are they classified
How are they Classified?
  • Shape of their protein coat (capsid)
    • Important in infection
  • Type of nucleic acid they contain
    • DNA or RNA
    • NEVER Both
how do viruses replicate
How do Viruses Replicate?
  • The lytic cycle:

1- absorption/attachment

2- injection/entry

3- replication of viral parts

4- assembly

5- release by lysis

  • Results in death of host cell
  • Virulent virus (only lytic cycle)
lysogenic cycle
Lysogenic Cycle
  • First steps just like lytic!!
  • Does NOT destroy the host cell
  • Nucleic acid joins the cell’s DNA. Viral DNA becomes a part of hosts cell DNA


  • Could go on for years
  • Temperate virus (capable of using the lytic and lysogenic cycles)
  • i.e. HIV, cold sores, shingles
types of viruses
Types of Viruses
  • Animal viruses: Rabies, Polio, Mumps, Chicken pox, Small pox, and Influenza.
  • Plant Viruses: Tobacco mosaic virus (TMV), Banana streak virus, Carrot thin leaf virus
  • Bacterial Virus: Bacteriophages ( T1, T2, T3, and T4.)
  • SPECIFIC in what type of cell and what type of organism they infect
    • Polio – human nerve cell
    • T4 – only certain strains of E. coli
different types of viruses
Different Types of Viruses
  • Respiratory infections; colds
influenza virus
Influenza Virus
  • Virus that causes the flu
  • RNA viruses that contain reverse transcriptase
  • This enzyme allows RNA to produce DNA
  • HIV is an example of the virus
questions discussion1
  • What some differences between the lytic and lysogenic cycle?
  • What type of virus is HIV?
  • How is HIV one of the most successful viruses in reproducing?
  • Lytic and Lysogenic Manipulative