Viruses

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Viruses
Are not cells.
Cannot reproduce, replicate in a host.
DNA/RNA core, surrounded by a protein coat.
Characteristics of Life of Viruses
Do not contain specialized organelles.
Cannot obtain and use energy.
Reproduce inside a living cell host.
Contain RNA/DNA
Significance of a Virus
Non-living.
Can cause disease in every kind of organisms-animals, plants, fungi, and bacteria.
Structure of a Virus
Envelope (outer part of the protein coat)
Capsid (inner part of the protein coat)
Nucleic Acid (DNA/RNA)
Virus Identification
Identified by which type of host it infects.
Identified by:
Shape
Type of nucleic acid
Structure of the capsid
Two main parts of a virus
Capsid and Nuclei
Binal Virus
Helical Virus
Polyhedral Virus
Viral Replication Lytic Cycle
Rapidly kills host cell
Viral Replication Lysogenic Cycle
Does not immediately kill a host cell
Harmless, but permanent and dormant until it enters the lytic cycle.
Divides with viral information.
Viruses are specific to their hosts
Viruses can only attack specific cells
Not all viruses can pass between different species (though some cane) - rabies.
The common cold is a virus that specifically attacks cells of the respiratory tract, causing coughing, sneezing and sniffling.
Other viruses attack other types of cells.
HIV Virus
Specifically, attacks T4 Helper cells of the immune system.
Prevention & Vaccination
Viruses cannot be killed with medicine, but many viral diseases can be prevented by:
Practicing good hygiene
Making good choices
Getting vaccinated
Vacination
Injecting a person with a weakened/dead virus. This stimulates the immune system to attack the virus if it ever enters the body again.
Remember, antibiotics kill ONLY bacteria
Temperate Virus
Lysogenic
Virulent Virus
Lytic, dangerous

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