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Viruses
Virus: Structure, Behavior, Reproduction etc.
19
Biology
11th Grade
11/18/2010

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Term
Non-Cellular:
Definition
Are not composed of cells.
Term
Viruses Consist of 4 Major Components:
Definition
-Protein Capsid
-Genetic Material
-Enzymes
-Receptors
Term
1.Protein Capsid:
Definition
A coat that protects the Genetic Material.
Term
2.Genetic Material:
Definition
Deoxyribonucleic Acid(DNA) or Ribonucleic Acid(RNA) which instructs the host cell on how to produce more viruses.
Term
3.Enzymes:
Definition
Aid viral entry and taking-over of the host cell.
Term
4.Receptors:
Definition
Allow the virus to attatch to a SPECIFIC host cell.
Term
Evidence that viruses are living:
Definition
- Contain Genetic Material(DNA/RNA)
- Consist of organic molecules such as enzymes
- Enzymes are used during replication
- Reproduce(although they require a host cell in order to do so)
Term
Evidence that viruses are non-living:
Definition
- Not composed of cells, or have a cell membrane
- Cannot carry out metabolie
- Do not breathe/grow
- Do not respond to environment
- Can be crystalized without causing harm
- Can ONLY reproduce with a host cell
Term
What is Viral Specifity:
Definition
Viruses have specific receptor to attatch to and infect a certain type of target cell as it's host.
Term
Viral Replication:
Definition
- Lytic Cylce
- Lysogenic Cycle
Term
The Lytic Cycle:
Definition
- Virus attatches to host cell
- Viral Enzymes allow entry of Genetic Material into the host cell
- Genetic Material takes over host cell and manufactures copies of the different parts of the virus
- Viruses rupture through cell wall
- Parts of virus attatch to the cell wall and "bud"
- Original host cell is destroyed or damaged
Term
Virulent:
Definition
Very active. Causes disease.
Term
Lysogenic Cycle:
Definition
- Virus attatches to host cell
- Enzymes allow entry of genetic material into the host cell
-Genetic material become incorperated in the host cell as a "provirus"
- The provirus DOES NOT take over the host
- Provirus is replicated
- Provirus will be replicated untill it becomes virulent
Term
Pathogenic:
Definition
A virus that causes disease via the Lytic Cycle
Term
Pevention:
Definition
- Vaccines
- Avoid contact with bodily fluids
Term
Vaccines:
Definition
Contain either weakened whole virus, or parts of the virus. The vaccine prepares the immune system for infection so if an actual infection occurs, the body can destroy it.
Term
Bodily Fluid:
Definition
- Kissing
- Shared eating utensils
- Sexual contact
- Blood transfusion
- Shared syringes
Term
Body Defenses:
Definition
- Phagocytic cells engulf and destroy viruses. They are found in the blood and other bodily fluids
- The immune system produces proteins called antibodies that bind to and destroy viruses
-Skin
- Body fluids: Tears, Oil, Sweat
- Gastric Juices
Term
Tumor Cells:
Definition
- Benign
- Malignant
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