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Viruses

Viruses. Wanted Dead or Alive!. I. What makes something alive?. Cells Reproduce Metabolism Grow and develop Homeostasis Organization Adapt Evolve. II. Viruses. Not cellular Only reproduce within a host Don’t consume energy Don’t grow or develop No Homeostasis Highly organized

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Viruses

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  1. Viruses Wanted Dead or Alive!

  2. I. What makes something alive? • Cells • Reproduce • Metabolism • Grow and develop • Homeostasis • Organization • Adapt • Evolve

  3. II. Viruses • Not cellular • Only reproduce within a host • Don’t consume energy • Don’t grow or develop • No Homeostasis • Highly organized • Adapt Easily • Evolve quickly

  4. 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

  5. Other Viral Anatomies

  6. 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

  7. IV. Lysogenic Life CycleInterpret and explain • Viral DNA or RNA joins the host’s DNA • Viral DNA is copied with the host’s • Virus can be dormant in thousands of cells • Once the conditions are correct, the virus becomes lytic • Hundreds of cells can be destroyed at once

  8. What is a Virus? • Made of nucleic acids that contain DNA which can infect cells and replicate within them

  9. 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 won’t kill you, the common cold will.

  10. Chicken Pox

  11. Influenza

  12. Mumps

  13. Small Pox

  14. Hepatitis A and B

  15. Common Cold

  16. Rabies

  17. Disease Symptoms Transmission Chicken Pox Blisters, rash, soreness, fever. Curable as a child, becomes shingles and is incurable as adults Inhalation Influenza Fever, chills, fatigue, cough, sore throat, muscle aches, weakness, headache. Can be fatal Inhalation Mumps Painful swelling of salivary glands Inhalation Small Pox Blisters, lesions, fever, malaise, blindness, disfiguring scars. Often Fatal Inhalation Hepatitis A&B Fever, chills, nausea, swollen liver, yellow skin, painful joints. Can lead to liver cancer Contaminated food, water, or blood Cold Sinus congestion, muscle aches, cough, fever Inhalation or direct contact Rabies Mental depression, fever, restlessness, difficulty swallowing, paralysis, convulsions. Can be fatal Bite from an infected animal VI. Other Viruses

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