1 / 30

VIRUSES (What the heck are they?)

VIRUSES (What the heck are they?). The Common Cold Virus. Oh Goodness, My E. coli has a Virus!. Viruses and Bacteria. It's easy to mix these up since compared to us, both are. VERY SMALL. Great link for size comparison! Source: http://www.cellsalive.com/phage.htm.

margarita
Download Presentation

VIRUSES (What the heck are they?)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. VIRUSES(What the heck are they?)

  2. The Common Cold Virus

  3. Oh Goodness, My E. coli has a Virus! Viruses and Bacteria It's easy to mix these up since compared to us, both are VERY SMALL. Great link for size comparison! Source: http://www.cellsalive.com/phage.htm

  4. The basics  Viruses are:  non-living much smaller than the smallest cell pieces of genetic coding (DNA or RNA) “gift-wrapped” in a protein coat

  5. Diversity of Capsids

  6. Diseases caused by viruses include: • Common cold • Flu • Polio • Rabies • Herpes (chickenpox,cold sores, genital) • Warts • Measles, Mumps • Ebola • AIDS Viruses cannot be killed with antibiotics because they are not alive!

  7. Antibodies attacking AIDS Virus

  8. Diversity of Life Introduction to Prokaryotes

  9. Figure 13.27a

  10. Figure 13.27b

  11. Prokaryote Diversity

  12. Two types of Prokaryotic organisms: Eubacteria (bacteria) and Archaea Prokaryotes Domain Bacteria Domain Archaea (e.g., extremophiles) Visual Summary 15.3

  13. Archaea – Thermophiles in a Nevada geyser.

  14. Archaea in a hot spring.

  15. Archaea – Halophiles in seawater evaporating ponds near San Francisco Bay. Salinity increases from 3% to 20% during the production of salt.

  16. Archaea (a.k.a. “Archaeabacteria) · Prokaryotic (like eubacteria) · Biochemically resemble eukaryotic cells · Believed to be the ancestors of eukaryotic cells ·Today: only live in harsh environments

  17. (Bacteria Review)What do you already know about bacteria??

  18. Bacteria on the tip of a pin.

  19. Major Episodes in the History of Life Millions of years ago Major Episode 475 570 1,000 1,700 2,500 3,500 4,500 Plants and fungi colonize land All major animal phyla established First multicellular organisms Oldest eukaryotic fossils Accumulation of atmospheric 02 Oldest prokaryotic fossils Origin of Earth Visual Summary 15.1

  20. ALL CELLS have • Plasma membrane • DNA • ribosomes

  21. Generalized structure of bacteria cell

  22. Figure4.5x2

  23. Bacterial shapes: cocci, rods, spirals

  24. Cyanobacteria or “blue-green algae”

  25. Bacterial colonies growing in culture.

  26. Detriments to Humans • Bad breath, tooth decay • Food poisoning • Some are pathogenicpathogenic –

  27. Some Diseases caused bybacteria • Strep throat • Cholera • Tubercolusis • “the plague” • Anthrax • Toxic shock syndrome • Syphilis, Gonorrhea,

  28. How cure bacterial infections? (Antibiotics)

  29. Discussion Question:Should we drop “bacteria bomb?” • Are there benefits to bacteria that outweigh their detriments to humans????

  30. Benefits of Bacteria • Decomposers!  chemical cycling • Cyanobacteria were original producers of oxygen atmosphere  ozone • Origins of mitochondria & chloroplasts • Aid humans in digestion (E. coli) • Allow cows to digest cellulose (grass)  milk, ice cream, hamburgers! • Lactic acid fermentation (yogurt, buttermilk, sauerkraut) • bioremediation • Nitrogen “fixers” (to be explained in Unit IV!)

More Related