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18 Cards in this Set
- Front
- Back
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What is a unique characteristic of viruses that distinguishes them from other major groups of microorganisms?
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Lack a cell structure.
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pasteur used swan neck flasks in his experiments to prove that;
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Dust in air was a source of living microorganisms.
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In classification, kingdom is a classification. List 4 other taxa that are contained within this taxon?
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species, phylum, genus and family.
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Taxonomy includes terms like, nomenclature,classification, taxa,identification. TRUE/FALSE
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TRUE.
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A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on...
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Determining evolutionary relatedness.
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List 4 characteristics of photosynthesis?
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1.CO2 is converted to organic material.
2. contributes to the O2 content in the atmospher 3. fueled by light 4. important to each ecosystems flow of energy and food. |
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select three correct descending taxanomic hierarchy, left to right.
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family-genus-species.
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The kingdom Monera does not contain any eucaryotes. TRUE/FALSE
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TRUE.
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Taxanomy is involved in the identification, classification and naming of organisms. TRUE/FALSE
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TRUE.
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Neisseria is the only pathogenic gram negative cocci. TRUE/FALSE
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TRUE.
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List 2 species of Neisseria that cause disease in humans?
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N. meningitidis/N. gonorroeae.
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Regarding N. meningitiditis what can be said of its capsule?
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It is a polysaccharide capsule and is antiphagocytic as long as there are no specific antibodies to coat(opsonize) the bacterium.
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What are the serogroups of N. meningitiditis?
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Serotypes are based on different capsular polysaccharides which are antigenic. there are 9 serotypes of meningococcus(designated A, B, C, D, X, Y, Z, W135 and 29E. Meningitis is caused by groups A, B and C.
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The meningococci can release endotoxin, which causes blood vessel destruction(hemorrhage) and sepsis and is seen as petecchiae. the adrenal glands may be damaged as well. TRUE/FALSE
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TRUE.
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What is IgA1 protease?
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This is only found in pathogenic species of neisseria. The enzyme cleaves IgA (antibody) in half.
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N. meningitiditis can extract iron from human transferrin via a non energy requiring mechanism. TRUE/FALSE
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TRUE.
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Can N. meningitiditis become of the normal flora?
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Yes, especially of the nasopharynx(5% of the population). These individuals are carriers and develop antimeningococcal antibodies.
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What is Waterhouse-Friderichsen syndrome?
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This is septic shock. Bilateral hemorrhage into the adrenal glands occurs which causes adrenal insufficiency. DIC may occur as well, as long as hypotension and tachycardia.
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