microbiology MCQs – Page 15

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

microbiology Mcqs
281. Which of the following is obligate aerobe ?
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A. Pseudomonas aerogenosa

B. Proteus

C. coli

D. diphtheria

282. Function of T-lymphocyte is/are________________?
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A. Production of interferon

B. Rosette formation

C. Lymphokine production

D. All of the above
283. A full course of immunization agianst. Telanus with 3 doses to Tetanus toxoid, confers immunity for how many years ?
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A. 10

B. 20

C. 15

D. 5

284. An elderly male patient presented with fever, chest pain, and dry cough, sputum culture showed growth on charcoal yeast Extract Medium, theorganism is______________?
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A. Moraxella catarrhalis

B. Legionella

C. H. influenza

D. Burkholderia cepacia

285. The single most important laboratory test for determining the virulence of staphylococci is___________?
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A. Detection of coagulase

B. Mannitol fermentation

C. The catalase test

D. Hemolysis of sheep erythrocytes

286. Which of the following is not a feature of anaphylaxis ?
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A. None of the above

B. Immediate reaction

C. Delayed reaction

D. passive transfer by serum

287. On a stained slide, clostridium tetani has the appearance of a__________________?
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A. Bunch of a

B. Safely pin

C. Chain of beads

D. Drum stick
288. Immunoglobin, Which is produced first by the fetus in response to infection_______________?
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A. IgM

B. IgG

C. IgD

D. IgA

289. Plasmid__________________?
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A. Involved in multidrug resistance transfer

B. Involved in conjugation

C. Imparts capsule formation

D. Imparts pili formation

E. Both A & B
290. Diphtheria is pathogenic only when infected with______________?
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A. Beta phage

B. Alfa phage

C. Lambda K12

D. Delta Phage

291. The function of IgD is______________?
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A. Antigen recognition by B cells

B. Reagin activity

C. Localization protection in external secretion

D. Compliment activation

292. Which organism causes prosthetic valve endocarditis within 60 days of surgery________________?
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A. Fungus

B. Staphylococcus aureus

C. Streptococcus Viridans

D. Staphylococcus epidermis
293. About Bacteroids True are all Except_______________?
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A. Most common species is B fragilis

B. Bile resistant anerobes

C. Present mainly in mixed infections

D. Susceptible to many antibiotics
294. The diagnosis of gonorrhea is established by_____________?
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A. Pili agglutination tests

B. Haemagglutination tests

C. All of the above tests

D. Compliment fixation tests

295. An example of naturally acquired passive immunity is__________________?
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A. Placental transfer of antibodies

B. Gamma globulin injection

C. Immune blood transfusion

D. Hepatitis vaccination

296. Selective media for MYCOBACTERIUM _____________?
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A. Lowenstein Jensen medium

B. Sabourauds medium

C. Loefflers serum slope

D. Agar agar

297. Encapsulation in bacteria helps in__________________?
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A. Oxygen effect

B. Spore formation

C. Decreased virulence

D. Prevent their phagocytosis
298. Sterilisation is______________?
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A. Non-pathogenic killed

B. All pathogenic and non-pathogenic microorganisms killed

C. Pathogens killed but spores are not affected

D. Only pathogenic micro-organisms killed

299. Dental Plaque adheres to tooth surface by________________?
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A. Bacteria

B. Dextran

C. Epithelial cells

D. Sucrose

300. The interaction of antigens with antibodies on the surface of a mast cel leads to degranulation and anaphylaxis. The mast cell granules produce anaphylaxis because they contain________________?
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A. Proteolytic enzymes

B. Lymphotoxins

C. Vasoactive mediators

D. Lysosomes