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The Virus

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The Virus
Engage
Ebola: The Plague Fighters
 Pathogens – How are they transmitted
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Explore
TMV – Tobacco Mosaic Virus
пЃ¬ Models of Viruses
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What is a Virus?
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Virus Latin for Poison
Non-cellular particle with
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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?
пЃ¬ What type of genetic material do viruses
have?
пЃ¬ Can they have both DNA and RNA?
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How are they Classified?
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Shape of their protein coat (capsid)
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Important in infection
Type of nucleic acid they contain
DNA or RNA
пЃ¬ NEVER Both
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Reproduction Cycles
How do Viruses Replicate?
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The lytic cycle:
1- absorption/attachment
2- injection/entry
3- replication of viral parts
4- assembly
5- release by lysis
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Results in death of host cell
Virulent virus (only lytic cycle)
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Lets Go Through the Steps of the
Lytic Cycle Together!!!
Lysogenic Cycle
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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
Lysogenic Cycle
Lets Go Through the Steps of the
Lysogenic Cycle!!!
Both Cycles Together
Types of Viruses
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Animal viruses: Rabies, Polio, Mumps,
Chicken pox, Small pox, and Influenza.
пЃ¬ Plant Viruses: Tobacco mosaic virus (TMV),
Banana streak virus, Carrot thin leaf virus
пЃ¬ Bacterial Virus: Bacteriophages ( T1, T2, T3,
and T4.)
пЃ¬ SPECIFIC in what type of cell and what type of
organism they infect
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Polio – human nerve cell
T4 – only certain strains of E. coli
Different Types of Viruses
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ADENOVIRUS
пЃ¬ Respiratory
infections; colds
Polio
Influenza Virus
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Virus that causes the flu
Small Pox
TMV
Retroviruses
RNA viruses that contain reverse
transcriptase
пЃ¬ This enzyme allows RNA to produce
DNA
пЃ¬ HIV is an example of the virus
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Questions/Discussion
What some differences between the lytic
and lysogenic cycle?
пЃ¬ What type of virus is HIV?
пЃ¬ How is HIV one of the most successful
viruses in reproducing?
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Viruses: Living or Not?
Elaborate
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Lytic and Lysogenic Manipulative
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