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pathogens an organism that causes disease chp 18 chp 39 see p 550 n.
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Pathogens : An organism that causes disease. ( Chp . 18/chp.39) see p.550 PowerPoint Presentation
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Pathogens : An organism that causes disease. ( Chp . 18/chp.39) see p.550

Pathogens : An organism that causes disease. ( Chp . 18/chp.39) see p.550

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Pathogens : An organism that causes disease. ( Chp . 18/chp.39) see p.550

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  1. Pathogens: An organism that causes disease. (Chp. 18/chp.39) see p.550

  2. Types of Diseases Contagious…if it spreads quickly • Non-communicableDisease: cannot be transmitted from one person to another • Heart attach • Depression • Stroke • Hypertension/hypo. • Cancer • Genetic disorders (only to their children) • Communicable Disease: can spread from one person to another • Diarrhea • Pneumonia • Tuberculosis (TB) • Sexually transmitted diseases (STD’s)

  3. Bacteria • Unicellular and everywhere • Some damage cells and tissues • Others release Toxins: poisons that travel through the body and may cause diseases • There are environmental toxins: Lead and Mercury Other toxins:Botulism> improperly prepare food

  4. Diseases Caused by Bacteria

  5. Viruses:Nonliving..Must have aLivingHost • Consist of genetic material enclosed in a protein coat (Capsid[head], nucleic acid, Sheath, Tail) • Bacteriophage (phage): a virus that infects a bacterium. The virus will attach its legs to a cell and then inject its genetic material into it. The virus takes control of the bacterial cell and directs it to produce viral material. A single infected cell may replicate thousands of viruses.

  6. A typical Bacteriophage, a type of virus Protein coat Attaches to a cell

  7. Viruses Cause…. • HIV • Influenza • Chickenpox • Colds • Measles • Rabies

  8. Viral Replication Cycles p. 478/479 • (1)Lytic Cycle: immediately takes over killing the host cell • (2) Lysogenic Cycle: does not kill host cell immediately integrates its genetic material with the host cell…creates a provirus…..sits dormant….then one day takes over the host

  9. Viral Replication Cycles