Viruses

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Viruses

• Wanted Dead or Alive!

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I. What makes something alive?

1. Cells
2. Reproduce
3. Metabolism
4. Grow and develop
5. Homeostasis
6. Organization
7. Adapt
8. Evolve

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II. Viruses

1. Not cellular
2. Only reproduce within a host
3. Dont consume energy
4. Dont grow or develop
5. No Homeostasis
6. Highly organized
7. Adapt Easily
8. Evolve quickly

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III. Draw and label a virus (pg 457 in your text)
Capsid Protein head filled with DNA or RNA
Body Tube releases enzymes that bore holes
through the host cell wall and membrane
Legs Hook onto the host cell membrane
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Other Viral Anatomies
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IV. Lytic Life cycleDo your best to interpret
and explain the diagram

• Attacks right away
• DNA or RNA take over host cell
• Turns cell into a viral factory
• Can make thousands of viral copies
• Example Ebola

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IV. Lysogenic Life CycleInterpret and explain

1. Viral DNA or RNA joins the hosts DNA
2. Viral DNA is copied with the hosts
3. Virus can be dormant in thousands of cells
4. Once the conditions are correct, the virus
   becomes lytic
5. Hundreds of cells can be destroyed at once

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What is a Virus?

• Made of nucleic acids that contain DNA which can
  infect cells and replicate within them

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V. HIV/AIDS find 3 facts about aids in your
text book

• A lysogenic Virus that attacks your immune cells
• Deadly because it destroys your resistance to
  other diseases
• AIDS wont kill you, the common cold will.

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Chicken Pox
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Influenza
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Mumps
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Small Pox
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Hepatitis A and B
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Common Cold
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Rabies
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VI. Other Viruses