Viruses Wanted Dead or Alive!

I. What makes something alive? A.Cells B.Reproduce C.Metabolism D.Grow and develop E.Homeostasis F.Organization G.Adapt H.Evolve

II. Viruses A.Not cellular B.Only reproduce within a host C.Don’t consume energy D.Don’t grow or develop E.No Homeostasis F.Highly organized G.Adapt Easily H.Evolve quickly

III. Draw and label a virus (pg 457 in your text) Capsid – Protein head filled with DNA or RNA Legs – Hook onto the host cell membrane Body Tube – releases enzymes that bore holes through the host cell wall and membrane

Other Viral Anatomies

IV. Lytic Life cycle Do your best to interpret and explain the diagram 1.Attacks right away 2.DNA or RNA take over host cell 3.Turns cell into a viral factory 4.Can make thousands of viral copies 5.Example: Ebola

IV. Lysogenic Life Cycle Interpret and explain 1. Viral DNA or RNA joins the host’s DNA 2.Viral DNA is copied with the host’s 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

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

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.

Chicken Pox

Influenza

Mumps

Small Pox

Hepatitis A and B

Common Cold

Rabies

VI. Other Viruses DiseaseSymptomsTransmission Chicken PoxBlisters, rash, soreness, fever. Curable as a child, becomes shingles and is incurable as adults Inhalation InfluenzaFever, chills, fatigue, cough, sore throat, muscle aches, weakness, headache. Can be fatal Inhalation MumpsPainful swelling of salivary glandsInhalation Small PoxBlisters, lesions, fever, malaise, blindness, disfiguring scars. Often Fatal Inhalation Hepatitis A&BFever, chills, nausea, swollen liver, yellow skin, painful joints. Can lead to liver cancer Contaminated food, water, or blood ColdSinus congestion, muscle aches, cough, fever Inhalation or direct contact RabiesMental depression, fever, restlessness, difficulty swallowing, paralysis, convulsions. Can be fatal Bite from an infected animal