Microbio exam 1

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Microbio exam 1
2011-02-06 14:59:57
microbio exam

microbio exam 1
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  1. Define the following microbe-host relationships: commensalism, symbiosis, mutualism, ammensalism and latency.
    • Symbiosis: stable relationship.
    • Commensalism: 1 benefits and the other is unaffected.
    • Mutualism: both benefit ( in the mouth, bacteria filled a niche so worse bacteria can’t
    • get in there).
    • Ammensalism: 1 injured, other one is unaffected (2 types of bugs in mouth: 1 bacteria produce Antibiotic and 1 is harm).
    • Latency: infection that dormant within the host (TB lives inside macrophage laying dormant, HIV has latent phase) You can still infect others when you are in latent phase.
  2. Define the following classifications of microbe host interactions: parasite, strict and opportunistic pathogen, infection, endogenous disease, exogenous disease, colonization, normal flora and disease.
    • Parasite: host is damage insymbiosis gone bad.
    • Pathogen: parasite that can and
    • does damage the host and cause disease.
    • Infection: a process where a pathogen/parasite is causing disease. Comes from 1 of 2 sources: exogenous source caused by microbe from outside your own body but not all disease is exogenous or endogenous disease caused by your own flora or a latent infection (shingles)
    • Opportunistic pathogen: One that will cause disease in the right time and place. Any bacteria can cause disease if its in the right place at the right time.
    • Strict pathogen: not flora EVER. (ex. M.
    • tuberculusosis)
    • Endogenous disease: diseas is produced by organisms in the person's own microbial flor that spread to inappropriate body sites
    • exogenous disease: diseases arise when a person is exposed to organisms from external sources
    • colonization: long term symbiotic disease
  3. Identify areas of the human body that should be free of microbes.
    Blood, brain, organs, bladder, urine
  4. Describe the flora of the skin and the defenses that prevent infections.
    Skin: keratonized, slightly acidic, normal flora
  5. Describe the flora of the eye as well as the defenses found there.