PHC 4031 Lecture Notes - Lecture 11: Transmissible Spongiform Encephalopathy, Prnp, Immunohistochemistry
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QUESTION 42
Which of the following is not true of viroids???
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| all of the above are true ? |
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| infectious nucleic acid? |
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| some have catalytic ability ? |
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| low molecular weight naked RNA ? |
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| infect plants and the animals that eat them ? |
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2 points
QUESTION 43
All of the following are true of prions except:?
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| They produce âmad cowâ disease.? |
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| A prion disease in humans resulted from cannibalism.? |
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| Prions are difficult to inactivate by conventionalchemical/physical means.? |
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| Prion diseases of animals are not transmissible to humans.? |
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| They are concentrated in tissues of the central (and enteric)nervous system.? |
?
2 points
QUESTION 44
Which is not true about plasmids ??
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| They may carry genes for exotoxins. ? |
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| All are correct ? |
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| They may carry genes for conjugation. ? |
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| They may carry genes for adhesins? |
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| They are small circular extrachromosomal pieces of double-strandedDNA. ? |
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2 points
QUESTION 45
Which of the following is false regarding thecyanobacteria? ??
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| Produce oxygen and previously called âblue green algae.â ? |
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| They have a less complete metabolism than spirochetes of syphilis (Treponema pallidum)which canât be grown in vitro.? |
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| They may form symbiotic associations with fungi called lichens.? |
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| They are the relatives of chloroplasts. ? |
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| Nitrogen fixing forms have the simplest nutritional requirements.? |
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2 points
QUESTION 46
Concerning helminthes, which of the following isfalse? ??
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| Taenia solium is the beef tapeworm. ? |
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| Certain nematodes (Wucheria bancrofti) may produce larvalforms, following injection by a mosquito, that may grow in andblock lymphatics leading to elephantiasis. ? |
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| The symbol of the medical profession, the Caduceus, may have comefrom the practice of winding Dracunculus medinensis(Guinea worm) on a stick to extract it. ? |
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| Consumption of the eggs of the pork tapeworm can cause systemicspread to the brain and other organs (cystercercosis). ? |
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| All of the above are true. ? |
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2 points
QUESTION 47
Which of the following is not true of Escherichia coli??
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| like Gr. B strep, a common cause of neonatal meningitis andsepticemia? |
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| lactose -? |
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| coliform and fecal coliform in water testing? |
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| most common cause of urinary tract infections? |
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| UPEC cause UTIs? |
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2 points
QUESTION 48
All of the following are true of mycobacteriaexcept: ??
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| produce granulomas in affected tissues. ? |
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| perhaps 1/3 of the world population is infected with M.tuberculosis. ? |
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| all of the above are true. ? |
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| M. bovis is a cause of TB, associated with unpasteurizedmilk. ? |
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| have high content of lipids and waxes in the wall and thus acidfast ? |
?
2 points
QUESTION 49
Which of the following is not true regarding Salmonella andShigella.?
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?
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| There is a capsule and an attenuated living vaccine for typhoidfever.? |
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| Shigella cause bacillary dysentery.? |
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| Shigella are H2S + and motile, Salmonella are H2S â andnonmotile.? |
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| Salmonella Typhi causes typhoid fever with serious systemicspread.? |
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| Shigella dysenteriae produces the most severe form of shigellosisand may lead to HUS and kidney damage due to production of Shigatoxin.? |
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2 points
QUESTION 50
Which is not true of Streptococcuspneumoniae? ??
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| ? |
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| Otitis media ? |
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| Main cause of lobar pneumonia ? |
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| Unconjugated and conjugated capsule vaccines ? |
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| Beta hemolytic |