Latin for                             “poison”A virus is a particle that can only beseen with an electron microscope.   1
Viruses are not cells and are not made-upof cells. They live only within a living celland have no attributes of a living o...
• A virus is made up  of genetic material  inside a protein  coat• Viruses do not  carry on most  metabolic  activities• V...
A virus is surrounded by a capsid (protein coat) which determines the shape of the virus.The capsid containsnucleic acids(...
Viruses are classified by: type of host cell presence of DNA or RNA (retroviruses) shape:                        Binal ...
Naming Viruses• After the disease   • Organism it  it causes (ex.        affects (ex.  Polio)                Tomato Mosaic...
• People who• Place where it’s                        identify it (ex.  found (ex. Ebola)     Epstein-Barr                ...
•   Viruses and bacteriophages invade cells    and use the host cells machinery to    synthesize more of their own    macr...
VIRAL REPLICATIONViruses replicate in one of two ways:• Lytic• Lysogenic                                        9
Virus attaches to                       LYTIC CYCLEhost cell.                                     Virus injects its       ...
11
LYSOGENIC CYCLE                  12
LYSOGENIC CYCLE• Does not begin immediately• Viral DNA (called a prophage)  attaches to the host cell’s  chromosomes – lie...
VIRAL DISEASES Disease       Transmission              SymptomsAIDS/HIV    Sexual contact;      Immune system failure;    ...
15
Most viruses have       NO cure(Influenza, & HIV), but some viruses   like Small- pox   have vaccines.Vaccines contain a w...
• http://acms7science.weebly.com/uploads/5/  2/4/8/5248911/viruses.ppt.pdf• http://freedownload.is/ppt/bacteria-and-  viru...
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Viruses

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Viruses

  1. 1. Latin for “poison”A virus is a particle that can only beseen with an electron microscope. 1
  2. 2. Viruses are not cells and are not made-upof cells. They live only within a living celland have no attributes of a living organismThey don’t… Contain a nucleus or cytoplasm Eat Grow Carry on respiration Or perform other biological functions 2
  3. 3. • A virus is made up of genetic material inside a protein coat• Viruses do not carry on most metabolic activities• Viruses that only attack bacteria are called bacteriophages 3
  4. 4. A virus is surrounded by a capsid (protein coat) which determines the shape of the virus.The capsid containsnucleic acids(either DNA or RNA).Tail fibersfor attachmentto host cell. 4
  5. 5. Viruses are classified by: type of host cell presence of DNA or RNA (retroviruses) shape: Binal Polyhedral 5 Filo
  6. 6. Naming Viruses• After the disease • Organism it it causes (ex. affects (ex. Polio) Tomato Mosaic) 6
  7. 7. • People who• Place where it’s identify it (ex. found (ex. Ebola) Epstein-Barr virus) 7
  8. 8. • Viruses and bacteriophages invade cells and use the host cells machinery to synthesize more of their own macromolecules.• Once inside the host the bacteriophage or virus will either go into a Lytic Cycle- destroying the host cell during reproduction. or• It will go into a Lysogenic Cycle - a parasitic type of partnership with the cell
  9. 9. VIRAL REPLICATIONViruses replicate in one of two ways:• Lytic• Lysogenic 9
  10. 10. Virus attaches to LYTIC CYCLEhost cell. Virus injects its DNACell lyses (breaksapart) and newviruses arereleased Virus DNA commands host cell to make new viral parts New viral parts assembled 10
  11. 11. 11
  12. 12. LYSOGENIC CYCLE 12
  13. 13. LYSOGENIC CYCLE• Does not begin immediately• Viral DNA (called a prophage) attaches to the host cell’s chromosomes – lies dormant.• The virus DNA integrates with the host DNA and the host’s cell helps create more virus DNA.• Environmental stimulus sends viral DNA into lytic cycle. 13
  14. 14. VIRAL DISEASES Disease Transmission SymptomsAIDS/HIV Sexual contact; Immune system failure; contaminated blood fatal or needlesCommon Inhalation, direct Sinus congestion, muscleCold contact aches, cough, feverSARS Inhalation, direct Headache, discomfort, contact body aches, chillsInfluenza Inhalation Headache, muscle ache,(Flu) sore throat, cough, fatigue, fever, chillsHPV Sexual contact Warts, may cause cervical cancerHerpes Direct contact Open sores on mucus membranes 14
  15. 15. 15
  16. 16. 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. 16
  17. 17. • http://acms7science.weebly.com/uploads/5/ 2/4/8/5248911/viruses.ppt.pdf• http://freedownload.is/ppt/bacteria-and- viruses-21171792.html 17

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