latin for “toxic” or “poison” a virus is a non-living microscopic particle, much smaller...
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Latin for “toxic” or “poison”
A virus is a non-living microscopic particle, much smaller than a bacteria, which cannot grow or reproduce apart from a living cell. A virus invades living cells, called a host cell, and must use the host cell in order to replicate itself.
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• Viruses are not affected by antibiotics.
• Viruses contain genetic information, either DNA or RNA surrounded by a protein.
• Viruses are much smaller than a bacteria.
• Viruses must have a host cell in order to replicate.
• All viruses are harmful, where as some bacteria can be beneficial to organisms.
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Most viruses have NO cure (Influenza, &
HIV), but some viruses like
Small- pox have vaccines.
Vaccines contain a weakened or killed virus that provides immunity
to the disease.
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Viruses are NOT cells and are not made-up of cells. They don’t…
Contain a nucleus or cytoplasm
Eat
Grow
Carry on respiration
Or perform other biological functions
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A virus is surrounded by a capsid (protein coat) which determines the shape of the virus.
The capsid contains nucleic acids (either DNA or RNA).
Tail fibers
for attachment to host cell.
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Disease Transmission Symptoms
AIDS/HIV Sexual contact; contaminated blood or needles
Immune system failure; fatal
CommonCold
Inhalation, direct contact
Sinus congestion, muscle aches, cough, fever
Smallpox
Inhalation Blisters, lesions, fever, blindness, scars; often fatal
Influenza(Flu)
Inhalation Headache, muscle ache, sore throat, cough, fatigue, fever, chills
Warts Direct contact Lumps on skin or mucus membranes
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Virus CycleLytic and Lysogenic Cycles