microbiology MCQs – Page 8

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

microbiology Mcqs

351. Which of the following have the capability to produce extra cellular polysaccharides______________?
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A. Strep. Mutans

B. Strep. pyogenes

C. Enterococcus

D. Peptostreptococcus

352. The commonly used fluorescent dye in the detection of tubercie bacilli________________?
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A. Auramine and Rhodamine

B. Congo red

C. Thioglavin

D. Acridine orange

353. Immunoglobulin consists of________________?
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A. 1 heavy, 2 light chains

B. 3 light, 1 heavy chain

C. 1 light, 1 heavy chain

D. 2 light, 2 heavy chains

354. The genetic ability of a bacterium to grow in the presence of several antibiotics is passed in vivo from one bacterium to another by_____________?
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A. Conjugation

B. Rarefaction

C. Transformation

D. Transduction

355. Which of the following are non-spore forming anaerobic bacteria that asume major significance in disease processes________________?
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A. Fusobacterium nucleatum

B. Bacteroides fragilis

C. Actinomyces Israeli

D. Peptostreptococcus anaerobius

E. All of the above

356. Multiple drug resistance of bacteria depends on which of the following_______________?
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A. Colicigenic factor (Col)

B. Fertility factor (F+)

C. All of the above

D. Resistance transfer factor (RTF)

357. Following are the characteristics of Vincents angina EXCEPT_______________?
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A. Caused due to malnutrition

B. Ulcerative gingivostomatitis

C. A symbiotic infection

D. Caused by leptospira interrogans

358. The diagnostic investigation for syphilis is__________________?
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A. TPI test

B. VDRL test

C. TPHA test

D. FTAB test

E. Both C & D

359. Culture medium for corynebacterium diphtheria______________?
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A. Mc Conkey

B. Loefflers serum slope

C. Lowenstein Jensen Medium

D. Saborauds agar

360. Which is not true about vibrio cholera_________________?
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A. Grows on simple media

B. Man is the only natural host

C. It is non-halophilic

D. Cannot survive in extracellular environment

361. Actinomycosis is caused by______________?
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A. Acid fast, non-motile bacillus

B. Anaerobic, gram positive, non-acid fast bacteria.

C. Retrovirus

D. Fungus

362. Common inhabitant of throat and tonsils is______________?
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A. Beta hemolytic streptococci

B. Alpha hymolytic streptococci (S. viridans)

C. Pneumococci

D. Staphylococci

363. Commonest mycobacterial infection in tropical countries_______________?
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A. Kansasi

B. M. tuberculosis

C. M. leprae

D. M. avium intracellulare

364. Phage conversion is required for________________?
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A. Tularemia

B. Diptheria

C. All o f the above

D. Gonorrhoea

365. Which of the following antibacterial substance is present in eggs and saliva ?
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A. Albumin

B. Lysozyme

C. Secretozyme

D. Isozyme

366. One of the following staining methods is an example of negative staining_______________?
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A. Zheil-Neilsons staining

B. Grams staining

C. India ink preparation

D. Fontanas staining

367. Bacteria acquire characteristics by all the following except_______________?
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A. Through plasmids

B. Through bacteriophages

C. Incorporating part of host DNA

D. Through conjugation

368. Neurotoxin of tetanus acts on______________?
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A. Brain

B. Synapse

C. Muscle

D. Spinal card

369. The spirochete which is associated with fusospirochetosis is______________?
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A. Borrelia burgdorferi

B. Treponema pallidum

C. Treponjema pertenue

D. Borrelia vincenti

370. Actinomycosis is a_________________?
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A. Aerobic fungal disease

B. Anaerobic bacterial disease

C. Aerobic bacterial disease

D. Anaerobic fungal disease

371. Synthesis of antibodies in plasma cells occurs in_________________?
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A. Nucleus

B. Golgi body

C. Mitochondria

D. Endoplasmic reticulum

372. Phospholipid used to investigate syphilis by the reagin test is________________?
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A. Cardiolipin

B. Serine

C. Palmityl lecithin

D. Plasminogen

373. The following are applicable to bacterial genoms except________________?
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A. It is composed of DNA

B. It doe not contain histones

C. It is circular

D. Its DNA has both introns and extrons

374. Staphylococcal toxic shock syndrome (SSS syndrome) is due to______________?
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A. Enterotoxin D

B. Enterotoxin B

C. Enterotoxin A

D. Enterotoxin F

375. Cough plate method is used to identify________________?
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A. Pertussis

B. M-Tuberculosis

C. Y. pestis

D. Mycoplasma

376. Noguchis medium is used for________________?
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A. Bordetella

B. Borrelia

C. None of the above

D. Brucella

377. Nagglers reaction is used in the diagnosis of______________?
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A. Gas gangrene

B. Wool sorters disease

C. Malaria

D. Whooping cough

378. All are not true for cultivation of anaerobic organisms except_______________?
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A. Incubator

B. anaerobic jar

C. Refrigerator

D. Centrifuge

379. Leprosy bacilli are transmitted from person to person by all except______________?
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A. Through breast milk

B. From open sore

C. Through intact skin

D. Dischange from nasal mucosa

380. T cell matures in______________?
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A. Lymph node

B. Payers patch

C. Thymus

D. Busra of Fabricius

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

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