The virus
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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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Engage
Engage

  • Ebola: The Plague Fighters

  • Pathogens – How are they transmitted


Explore
Explore

  • 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
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

    (prophage)

  • 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

  • ADENOVIRUS

  • Respiratory infections; colds



Influenza virus
Influenza Virus

  • Virus that causes the flu




Retroviruses
Retroviruses

  • RNA viruses that contain reverse transcriptase

  • This enzyme allows RNA to produce DNA

  • HIV is an example of the virus


Questions discussion1
Questions/Discussion

  • 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?



Elaborate
Elaborate

  • Lytic and Lysogenic Manipulative


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