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Viruses are so small, they make bacteria look big!
What is it?? A virus is basically a piece of nucleic acid (DNA or RNA) encased in a tough outer covering of protein Viruses ≠ Bacteria Viruses are so small, they make bacteria look big!
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NOT Living! Viruses DO NOT:
Reproduce Use energy Grow Have cell parts like organelles or cytoplasm Have cells Therefore NOT LIVING No Classification with the living organisms
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What do they look like??
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Types of Viruses Some human viral diseases include: HIVAIDS
Chicken pox Colds Cold sores Influenza (flu) Ebola Measles Mumps Polio Rabies Smallpox Warts
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What are they made of??
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What do they do?? Viruses may infect eukaryotic cells like ours or they could infect a bacteria! First they attach to the host cell Then they inject their little piece of nucleic acid into the cell That nucleic hijacks the cell’s DNA and turns it into a virus factory making only virus parts!
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Infected… The result… Cells fill up with viral pieces and EXPLODE spreading the viruses Sometimes infection will happen immediately Some stay latent or dormant for years
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Defensive/preventative
Offensive & Defense Defensive/preventative Offensive Vaccine – a weakened form of the virus Vaccination – giving vulnerable animals a vaccine to alert the immune system to the structure of the pathogen Good hygiene – practicing constant cleaning People Food Antibodies – proteins that attach to virus and alert WBCs to eat it! Interferon – chemical interferes with the manufacture of virus parts in an infected cell and non-infected cell Immune Response – bodies police force
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Additional Questions about Viruses?
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