microbiology MCQs – Page 20

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

microbiology Mcqs
381. Staphylococci typically occur in_________________?
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A. Tetrads

B. Chains

C. Irregular clusters

D. Pairs

382. The chemotactic factor is______________?
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A. C3b

B. C2a

C. C5a

D. C4a

383. Techoic acid is present in_____________?
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A. Cytoplasm of Gram negative organisms

B. Cell wall of Gram negative organisms

C. Cell wall of Gram positive organisms

D. Cytoplasm of Gram positive organisms

384. Purpose of Sterilization is to eliminate________________?
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A. Bacteria

B. Viruses

C. Fungus

D. Spore formers
385. The virulence factors of Neisseria gonorrhea include all of the following except____________?
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A. Pili

B. IgA Protease

C. M-Proteins

D. Outer membrane proteins

386. Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________?
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A. Filamentous rods

B. Cocci

C. Bacteriophages

D. Spirochetes
387. All are true about legionella pneumophilia except______________?
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A. Person to person transmission

B. Aquatic bodies are main habitat

C. It can replicate in amoeba

D. Urine test is a reliable method

388. Fimbriae are demonstrated by ___________________?
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A. Culture

B. Biochemical reaction

C. Gram stain

D. Haemagglutination test
389. The binding site for complement on the IgG molecule is in the________________?
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A. CL domian

B. CH1 domian

C. VL domian

D. CH2 domian
390. The major antiseptic value of soap lies in its ability to_____________?
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A. Remove microbes

B. Inhibit microbial growth

C. Kill mircobes

D. Dehydrate microbial cells

391. Sporulation occurs in__________________?
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A. Log phase

B. Stationary phase

C. Decline phase

D. Lag phase

392. Endotoxin have all but one of the properties given below_______________?
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A. Not secreted outside the cell

B. Cannot be toxoided

C. Produced by gram positive bacteria

D. Produced by gram negative bacteria

393. Which of the following enzyme is required to induce the formation of a plasma clot pathogenic staphylococci_____________?
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A. Coagulase

B. Lysozyme

C. S protein

D. Fibrinolysin

394. Causative organism for gas gangrene_______________?
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A. Clostridium tetani

B. Clostridium welchii

C. Coli

D. Strep. Faecalis

395. Silver impregnation method of staining is useful to demonstrate_____________?
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A. Bacterial flagella

B. Spirochetes

C. Both of the above

D. None of the above

396. Virulence of Gonococcus is due to___________________?
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A. Its intracellular location

B. Cell Membrane

C. Cytolytic enzymes

D. Pili
397. Which one of the following enteric organisms is anaerogenic and non motile ?
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A. Salmonella typhi

B. Proteus mirabilis

C. Klebsiella pneumonia

D. Shigella sonnei
398. Which of the following characteristics of bacteria is not true?
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A. Unicellular

B. Having either DNA or RNA

C. Cell wall containing muramic acid

D. Free living

399. B.C.G untrue is_____________?
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A. All of the above

B. T.B vaccine

C. Orally administered

D. live vaccine

400. Delayed tuberculin test response is due to_______________?
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A. Monocytes

B. T lymphocytes

C. Histiocytes

D. B lymphocytes