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

Oth

er V

iral

Ana

tom

ies

IV. Lytic Life cycleDo your best to interpret and explain

the diagram1. 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 CycleInterpret 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 VirusesDisease 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