Question

QUESTION 42

Which of the following is not true of viroids???

		all of the above are true ?
		infectious nucleic acid?
		some have catalytic ability ?
		low molecular weight naked RNA ?
		infect plants and the animals that eat them ?

?

2 points

QUESTION 43

All of the following are true of prions except:?

?

		They produce “mad cow” disease.?
		A prion disease in humans resulted from cannibalism.?
		Prions are difficult to inactivate by conventionalchemical/physical means.?
		Prion diseases of animals are not transmissible to humans.?
		They are concentrated in tissues of the central (and enteric)nervous system.?

?

2 points

QUESTION 44

Which is not true about plasmids ??

		They may carry genes for exotoxins. ?
		All are correct ?
		They may carry genes for conjugation. ?
		They may carry genes for adhesins?
		They are small circular extrachromosomal pieces of double-strandedDNA. ?

?

2 points

QUESTION 45

Which of the following is false regarding thecyanobacteria? ??

		Produce oxygen and previously called “blue green algae.” ?
		They have a less complete metabolism than spirochetes of syphilis (Treponema pallidum)which can’t be grown in vitro.?
		They may form symbiotic associations with fungi called lichens.?
		They are the relatives of chloroplasts. ?
		Nitrogen fixing forms have the simplest nutritional requirements.?

?

2 points

QUESTION 46

Concerning helminthes, which of the following isfalse? ??

		Taenia solium is the beef tapeworm. ?
		Certain nematodes (Wucheria bancrofti) may produce larvalforms, following injection by a mosquito, that may grow in andblock lymphatics leading to elephantiasis. ?
		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. ?
		Consumption of the eggs of the pork tapeworm can cause systemicspread to the brain and other organs (cystercercosis). ?
		All of the above are true. ?

?

2 points

QUESTION 47

Which of the following is not true of Escherichia coli??

?

		like Gr. B strep, a common cause of neonatal meningitis andsepticemia?
		lactose -?
		coliform and fecal coliform in water testing?
		most common cause of urinary tract infections?
		UPEC cause UTIs?

?

2 points

QUESTION 48

All of the following are true of mycobacteriaexcept: ??

		produce granulomas in affected tissues. ?
		perhaps 1/3 of the world population is infected with M.tuberculosis. ?
		all of the above are true. ?
		M. bovis is a cause of TB, associated with unpasteurizedmilk. ?
		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.?

?

?

		There is a capsule and an attenuated living vaccine for typhoidfever.?
		Shigella cause bacillary dysentery.?
		Shigella are H2S + and motile, Salmonella are H2S – andnonmotile.?
		Salmonella Typhi causes typhoid fever with serious systemicspread.?
		Shigella dysenteriae produces the most severe form of shigellosisand may lead to HUS and kidney damage due to production of Shigatoxin.?

?

2 points

QUESTION 50

Which is not true of Streptococcuspneumoniae? ??

		?
		Otitis media ?
		Main cause of lobar pneumonia ?
		Unconjugated and conjugated capsule vaccines ?
		Beta hemolytic