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BACTERIA & VIRUSES

BACTERIA & VIRUSES. BACTERIA. PROKARYOTIC in 1 of 2 Kingdoms Eubacteria Archaebacteria. EUBACTERIA. ARCHAEBACTERIA. LARGER MORE VARIETIES CELL WALL CONTAINS PEPTIDOGLYCAN SOME HAVE DOUBLE CELL MEMBRANE. NO PEPTIDOGLYCAN MEMBRANE LIPIDS DIFFERENT

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BACTERIA & VIRUSES

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  1. BACTERIA & VIRUSES

  2. BACTERIA PROKARYOTIC in 1 of 2 Kingdoms Eubacteria Archaebacteria

  3. EUBACTERIA ARCHAEBACTERIA LARGER MORE VARIETIES CELL WALL CONTAINS PEPTIDOGLYCAN SOME HAVE DOUBLE CELL MEMBRANE NO PEPTIDOGLYCAN MEMBRANE LIPIDS DIFFERENT SOME DNA SEQUENCES MORE SIMILAR TO EUKARYOTIC CELLS THAN TO EUBACTERIA

  4. Identification SHAPE CELL WALL COMPOSITION MOTILITY METHOD OF OBTAINING ENERGY

  5. SHAPES BACILLI RODS COCCI BALLS SPIRILLA CORK-SCREW

  6. Energy Anaerobes Aerobes • Obligate • Cannot tolerate oxygen • Faculative • =/- oxygen • Obligate • Oxygen required

  7. Growth & Reproduction Binary Fission asexual reproduction trigger: growth reaches 2x http://www.classzone.com/books/hs/ca/sc/bio_07/animated_biology/bio_ch05_0149_ab_fission.html

  8. Growth & Reproduction Conjugation Exchange of DNA thru hollow bridge that forms between 2 bacteria Increases genetic diversity http://highered.mcgraw-hill.com/sites/dl/free/0072835125/126997/animation6.html

  9. Growth & Reproduction EndosporeFormation Used when environmental conditions unfavorable Dormancy can last years

  10. Importance of Bacteria DECOMPOSERS NITROGEN FIXERS INDUSTRIAL USES SYMBIOSIS in HUMANS

  11. TRANSFORMATION of BACTERIA During transformation a cell takes in DNA from outside the cell becoming a permanent component of the cell’s genome.

  12. PLASMIDS SMALL CIRCULAR PIECE OF DNA NATURALLY FOUND IN SOME BACTERIA CONTAINS DNA THAT PROMOTES REPLICATION HAS GENETIC MARKER

  13. EUKARYOTIC CELL TRANSFORMATION PLANTS ANIMALS CAN REMOVE CELL WALL & CELL MAY SPONTANEOUSLY TAKE UP FOREIGN DNA OR INJECT PLASMIDS INTO CYTOPLASM GENES CAN BE REPLACED

  14. Pathogens disease-causing agents

  15. Bacterial Infections Louis Pasteur 1st to prove bacteria can cause disease bacteria produce illness in 1 of 2 ways: directly damage host cells or tissues release toxins (poisons) that then circulate throughout body interrupting homeostasis

  16. Preventing Bacterial Disease vaccines: preparation of killed or weakened pathogens that prompts the immune system of the organism to produce immunity to the disease should they ever come in contact with it

  17. Treating Bacterial Infections antibiotics: compounds that block reproduction of bacteria or kill them availability of antibiotics (since ~WWII) has been 1 of major reasons life expectancy increased dramatically during the 20th century

  18. Controlling Bacterial Growth heat sterilization: destroys bacteria by heating equipment used on patients to ~ 125 ◦C using either moist heat or dry heat disinfectants: chemical solutions that kill bacteria, overuse in homes (antibacterial soaps) increase chance of resistance food processing: food stored @ lower temperatures stays fresher longer because it decreases the bacterial reproductive rate; cooking food before consumption also kills bacteria

  19. VIRUSES NON-LIVING MADE OF A PROTEIN COAT (CAPSID) SURROUNDING NUCLEIC ACID

  20. Bacteriophage Tobacco Mosaic Virus

  21. Influenza Virus Rhinovirus

  22. 2 Types Viral Infection Lytic Lysogenic Cell infected with 1 virus Takes over host cell metabolism Make many copies of nucleic acid & capsids assemble Cell bursts (lysis) releasing many copies of virus Cell infected with 1 virus Its DNA inserts into bacteria’s loop of DNA Replicates as that cell goes through cell division

  23. LYTIC CYCLE

  24. LYSOGENIC CYCLE

  25. Animations http://www.bio-alive.com/animations/virology.htm

  26. Viral Disease in Humans • viruses make you sick by disrupting homeostasis in tissues and cells of your body • viruses cannot be treated with antibiotics • best protection is prevention • Vaccines : measles, mumps, chicken pox, influenza, HPV • treatment: once sick symptoms treated often with OTC products some anti-viral meds available

  27. Viral Diseases in Animals viruses produce serious animal disease examples: hoof-and-mouth (or foot-and-mouth), BPV, swine flu, bird flu

  28. Viral Disease in Plants threat to agricultural plants because plant cells surrounded by a cell wall the plant viruses have a more difficult time infecting cells many plant viruses have adaptations that allow them to enter damaged cells (small teat in a leaf means some cells damaged)

  29. VIRUSES / CELLS COPY FIGURE 19-11 FROM PAGE 483 OF BOOK ONTO PAGE 113of notebook Draw a virus and a bacteria of your choice

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