Mcq Subject: Microbiology

In the small intestine, cholera toxin acts by-

A. ADP ribosylation of the G regulatory protein

B. Inhibition of adenyl cyclase

C. Activation of GTP ase

D. Active absorption of NaCl

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What does a positive schick test indicate?

A. Carrier of diphtheria

B. Immune to diphtheria

C. Susceptible to diphtheria

D. Hypersensitivity to diphtheria

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A microbiologist carries out milk ring test, which is positive. What is the most likely organism?

A. Salmonella

B. Brucella

C. Bordetella

D. Bacillus anthracis

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Gram stain is a?

A. Simple stain

B. Differential stain

C. Negative stain

D. Fluorescent stain

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Dimorphic fungi are all except –

A. Coccidioidomycosis

B. Blastomycosis

C. Candida

D. None

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Spoligotyping is done for –

A. Staphylococcus

B. Salmonella

C. Mycobacterium tuberculosis

D. Brucella abortus

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A 20yr old patient with a recent history of swimming in fresh water developed headache, fever, vomiting, seizures.CSF examination revealed motile amoeba which is the probable causative agent?

A. Naegleria

B. Acanthamoeba

C. Balamuthia

D. Entamoeba histolytica

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One of the following is a treponemal test for diagnosis of syphilis

A. FTAB

B. Widal test

C. Wasserman test

D. Kahn test

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Which one of the following statement is true regarding pathogenicity of Mycobacteria species ?

A. M. tuberculosis is more pathogenic than M.bovis to the humans

B. M. Kansasii can cause a disease indistinguishable from tuberculosis

C. M.Africanum infection is acquired from the environmental source

D. M.Marinum is responsible for tubercular lymphadenopathy

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