QUESTION 42 Which of the following is not true of viroids? ?? all of the above a
ID: 70077 • Letter: Q
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 conventional chemical/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-stranded DNA. ?
?
2 points
QUESTION 45
Which of the following is false regarding the cyanobacteria? ??
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 is false? ??
Taenia solium is the beef tapeworm. ?
Certain nematodes (Wucheria bancrofti) may produce larval forms, following injection by a mosquito, that may grow in and block lymphatics leading to elephantiasis. ?
The symbol of the medical profession, the Caduceus, may have come from the practice of winding Dracunculus medinensis (Guinea worm) on a stick to extract it. ?
Consumption of the eggs of the pork tapeworm can cause systemic spread 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 and septicemia?
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 mycobacteria except: ??
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 unpasteurized milk. ?
have high content of lipids and waxes in the wall and thus acid fast ?
?
2 points
QUESTION 49
Which of the following is not true regarding Salmonella and Shigella.?
?
?
There is a capsule and an attenuated living vaccine for typhoid fever.?
Shigella cause bacillary dysentery.?
Shigella are H2S + and motile, Salmonella are H2S – and nonmotile.?
Salmonella Typhi causes typhoid fever with serious systemic spread.?
Shigella dysenteriae produces the most severe form of shigellosis and may lead to HUS and kidney damage due to production of Shiga toxin.?
?
2 points
QUESTION 50
Which is not true of Streptococcus pneumoniae? ??
?
Otitis media ?
Main cause of lobar pneumonia ?
Unconjugated and conjugated capsule vaccines ?
Beta hemolytic
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 ?
Explanation / Answer
42. Viroids are the smallest, and low molecular weight infectious particles. They are composed solely of a short strand of circular, single-stranded RNA without protein coat. They mainly infect plant and animals that eat them.
Hence, the correct option is all of them are true.
43. The exception is Prion diseases of animals are not transmissible to humans.
44. All are correct
45. The false statement is They are the relatives of chloroplasts.
46. The false statement is Taenia solium is the beef tapeworm.
47. lactose
48. all of the above are true.
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