micro/talaro 2
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- What is a unique characteristic of viruses that distinguishes them from other major groups of microorganisms?
- Lack a cell structure.
- pasteur used swan neck flasks in his experiments to prove that;
- Dust in air was a source of living microorganisms.
- In classification, kingdom is a classification. List 4 other taxa that are contained within this taxon?
- species, phylum, genus and family.
- Taxonomy includes terms like, nomenclature,classification, taxa,identification. TRUE/FALSE
- TRUE.
- A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on...
- Determining evolutionary relatedness.
- List 4 characteristics of photosynthesis?
-
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. - select three correct descending taxanomic hierarchy, left to right.
- family-genus-species.
- The kingdom Monera does not contain any eucaryotes. TRUE/FALSE
- TRUE.
- Taxanomy is involved in the identification, classification and naming of organisms. TRUE/FALSE
- TRUE.
- Neisseria is the only pathogenic gram negative cocci. TRUE/FALSE
- TRUE.
- List 2 species of Neisseria that cause disease in humans?
- N. meningitidis/N. gonorroeae.
- Regarding N. meningitiditis what can be said of its capsule?
- It is a polysaccharide capsule and is antiphagocytic as long as there are no specific antibodies to coat(opsonize) the bacterium.
- What are the serogroups of N. meningitiditis?
- 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.
- 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
- TRUE.
- What is IgA1 protease?
- This is only found in pathogenic species of neisseria. The enzyme cleaves IgA (antibody) in half.
- N. meningitiditis can extract iron from human transferrin via a non energy requiring mechanism. TRUE/FALSE
- TRUE.
- Can N. meningitiditis become of the normal flora?
- Yes, especially of the nasopharynx(5% of the population). These individuals are carriers and develop antimeningococcal antibodies.
- What is Waterhouse-Friderichsen syndrome?
- 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.