microbiology MCQs – Page 21

Practise focused microbiology questions with marked answers for exam preparation and subject revision.

microbiology Mcqs
401. Opacity around colonies of Clostridium perfringens is due to_________________?
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A. Desmolase

B. Lecithinase

C. Theta toxin

D. Cytokinin

402. Immunoglobulin implicated in atopy and anaphylaxis is_______________?
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A. IgE

B. IgM

C. IgA

D. IgG

403. All of the following lab tests can be used to distinguish streptococcus mutans from other oral streptococci, except______________?
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A. Colony morphology on saliva agar

B. Production of intracellular and extracellular adherent polysacharide

C. Gram staining

D. Fermentation of mannitol and sorbital

404. Pathogenic treponemas can be maintained in________________?
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A. Chick embryos

B. Tissue culture

C. Rabbit testis only

D. Artificial media

405. Staphylococcal food poisoning includes the following features_______________?
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A. Common with dairy products

B. Heat labile enterotoxin

C. Incubation period of 24 hours

D. Requires immediate antibiotics

406. Bacteria with potent exotoxin is_______________?
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A. Shigella

B. Pseudomonas

C. Klebsiella

D. Clostridium tetani
407. First released immunoglobulin after primary immunization_______________?
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A. IgD

B. IgG

C. IgM

D. IgE

408. Graves disease is an example of type immunologic response_________________?
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A. Type I

B. Type II

C. Type IV

D. Type III

409. Serum sickness syndrome is an example of________________?
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A. Angioneurotic edema

B. Systemic arthus reaction

C. Anaphylactic

D. Cell-mediated immunity

410. The specific test for Treponema pallidum is___________?
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A. TPHA

B. VDRL

C. Widal test

D. Kahns test

411. Leprosy bacilli can be grown in_________________?
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A. Testes of albino rats

B. Foot paid on nine branded armadilo

C. Testes of guinea pig

D. Tail of guinea pig

412. Borelia vincenti is a______________?
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A. Spirochaete

B. Mycoplasma

C. Chlamydia

D. Mycobacteria

413. Rickettsiae__________________?
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A. Respond to tetracycline therapy

B. Transmitted by arthropod vectors

C. All of the above

D. Multiply within living cell

414. Black pigmented anaerobes include all of the following except______________?
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A. Porphyromonas

B. Tannerella

C. Prevotella

D. Buccae
415. Antigen used in Weil-Felix reaction______________?
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A. Staphylococcus

B. Proteus

C. Haemophilus

D. E.coli

416. Resistance of Staphylococcus aureus is due to ________________________?
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A. Pleomorphism

B. Penicillin analogue production

C. Lack of nucleic acid in the cell wall

D. Elaboration of an enzyme that destroy penicillin
417. Which of the following structures, found external to the bacterial cell wall, are involved in bacterial attachment to cell surfaces?
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A. Pili

B. Mesosomes

C. Capsule

D. Flagella

418. Actinomycetes is______________?
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A. Gram positive bacteria

B. Fungus

C. A yeast like form

D. Gram negative bacteria

419. Loss of capsule in bacteria is generally associated with______________?
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A. increase in invasiveness

B. Decease in virulence

C. Inability to spread through tissue

D. Loss of infectivity

420. Staphylococcus does not causes_______________?
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A. Abscess

B. Scarlet fever

C. Osteomyelitis

D. Pneumonia