viruses pa state standards:. what are viruses? 1) a nucleic acid (dna or rna) surrounded by a coat...

VIRUSES PA State Standards:

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Nonliving Properties of Viruses 1) Not made of Cells (no organelles or cell functions). 2) Can’t grow or reproduce on their own (reproduce inside the cells of other organisms). 3) Can be crystallized & stored for years.

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VIRUSES

PA State Standards:

What are VIRUSES?

1) A nucleic acid (DNA or RNA) surrounded by a coat of protein.

2) Viruses are not considered to be alive (they are not in one of the five kingdoms).

Nonliving Properties of Viruses

1) Not made of Cells (no organelles or cell functions).

2) Can’t grow or reproduce on their own (reproduce inside the cells of other

organisms).

3) Can be crystallized & stored for years.

Page 4: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

Examples of Viruses:Bacteriophage

Head

Tail

Capsid

DNA

Tail Fibers

Page 5: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

Examples of Viruses:

Influenza VirusCapsid

RNA

Proteinspikes

Page 6: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

What is a parasite

An organism that attaches itself and feeds off of another organism.

A parasite does harm to the organism it is attached to

Hookworm

Page 7: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

What is a host

The organism that is harmed or hurt by the parasite

Example: You are the host to a mosquito

Page 8: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

Bacteriophage Reproductive Cycle

Page 9: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

1- Attach

Virus attaches to cell. Use tail to attach to cell membrane of cell.

Bacteriophage

Bacteria

Page 10: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

2- Invade

Viral DNA invades cellVirus injects nucleicacid into the cell.

Viral DNA penetrates cell membrane/cell wall

Viral DNA slides into host cell

Page 11: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

3- Copy

a) Virus’ nucleic acid attaches to DNA of the cell.

Viral DNA

Bacterial DNA

Page 12: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

Bacteria is forced to make more & more viruses

3- Copy

b) DNA copies and makes new virusesVirus takes control of cell & makes new virus particles.

Page 13: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

4- Release

Cell bursts releasing hundreds of new viruses

Page 14: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

Bacteriophage Reproductive Cycle

Page 15: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

5- VIRUSES & DISEASE

1) HUMANS

a) Colds

b) A.I.D.S.Aquired Immune Deficiency

SyndromeH.I.V. – Human Immunodeficiency Virus

Page 16: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

5- VIRUSES & DISEASE

1) HUMANS

c) Polio

Iron Lung

F.D.R.Deformed Leg

Caused by Polio

Page 17: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

5- VIRUSES & DISEASE

2) ANIMALS

Rabies

Page 18: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

5- VIRUSES & DISEASE

3) PLANTS

Tobacco Mosaic Virus

Page 19: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

How are viruses transmitted?

Direct contact Touching, body fluids, etc.

Vectors - mosquitoes, flies, etc

Airborne Spread by the air

Page 20: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

Terms to know:

What happens when a disease spreads fast in a certain area?

An epidemic What system in your body is used to help stop

you from getting sick? The immune system What is a small amount of a virus injected into

your body to give you immunity called? A vaccine

Page 21: VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive

CREDITS

http://www.cat.cc.md.us/courses/bio141/lecguide/unit2/viruses/lysosum.html

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