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Viruses

CC BY Lynette Hauser, Tidewater Community College

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Viruses

  1. 1. Viruses  A cellular  No organelles  Parasitic  Must infect a host in order to reproduce  Infect a diversity of organisms  Examples: AIDS, chicken pox, herpes  Do not have all characteristics of life  Can’t metabolize or grow  Evolutionary pathway unclear
  2. 2. Morphology  Viron: single virus particle  Basic structure:  Nucleic acid core (DNA or RNA)  Capsid: Protein external covering  4 main shapes  Filaments  Isometric  Envelope  Head and Tail
  3. 3. Genetic Information  Can be DNA or RNA genome  Genome is small  DNA viruses: DNA directs host cell’s replication  Make new copies of viral genome and then transcribe and translate the viral proteins  RNA viruses: RNA makes enzymes that can replicate RNA into DNA
  4. 4. Ways a virus can spread 1. Contact transmission  Shaking hands, kissing  Bodily fluids (saliva, breast milk) 2. Indirect contact  Utensils, cups, bedding 3. Droplet spread  Coughing, sneezing If a virus spreads quickly it can become an epidemic
  5. 5. Virus Prevention  Vaccine  Builds immunity  Prepared from live or dead virus  Human childhood vaccines: polio, mumps, measles, rubella, chicken pox  Live vaccines more effective  Small chance it could mutate to become infectious
  6. 6. Today’s Lab  Virus transmission simulation  Complete as a class  Pretend to share bodily fluids  Dolphin case study: Based on real life  Significant increase in dolphin strandings in 2013–2014  Possibly due to cetacean morbillivirus  To complete the lab  Complete internet research  Answer the questions in the word document

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