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Viruses

Viruses. From Plants to Bacteria Chapter 2.1 Pages 48-54. What is a Virus?. ?. What is a Virus?. A small, non-living particle that invades and reproduces in a cell Non-living because… I t is not a cell Does not use energy to grow / respond Do not make or eat food Do not produce waste.

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Viruses

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  1. Viruses From Plants to Bacteria Chapter 2.1 Pages 48-54

  2. What is a Virus? ?

  3. What is a Virus? • A small, non-living particle that invades and reproduces in a cell • Non-living because… • It is not a cell • Does not use energy to grow / respond • Do not make or eat food • Do not produce waste

  4. Being a Good Host • Viruses only multiply inside a living cell, or Host • Organisms that live on / in a host and cause harm to the host are called Parasites • When 2 organisms are mutually beneficial to each other, Symbiosis.

  5. Naming Viruses • Not living, so do not use binomial nomenclature • Can be named for… • Disease it causes (Polio) • Organism it infects (Tomato Mosaic Virus) • Scientist who discovers it (Epstein-Barr)

  6. Shapes & Sizes • Viruses vary in both shape and size (p50) • The smallest organism, single-celled bacteria, is 750nm (an atom is 0.1nm) • Viruses average 50-60nm

  7. Equal Opportunity Destroyer • Viruses can infect any organism, including bacteria • This is related to viruses size and structure • Two Parts • Outer Protein Coating • Attaches only to the type of cell the virus will attack • Inner genetic material

  8. Multiply and Conquer • Once attached, the virus enters the cell and takes control of the cell’s functions • Redirects the cell to produce proteins and genetic material to assemble new viruses.

  9. Dual Threat • Active Viruses immediately domineer a cell and begin mass production • Production continues until the host is full of copies, then bursts • Hidden Viruses enter a cell and meld with its genetic material • Eventually (days, months, years later) the virus becomes active • Trigger is unknown • As suddenly as it began, virus can go dormant

  10. What to Work On • Read pages 48-54 • Answer questions 1-3 on page 54 DUE: Friday, October 14th

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