microbiology Mcqs
451. Erysipelas is caused by________________?
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A. Pneumococci

B. Group A steptococci

C. Group B staphylococci

D. Gonococci

452. The most frequently encountered clostridial species in gas gangrene is______________?
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A. Clostridium tetani

B. Clostridium botulinum

C. Clostridium difficile

D. Clostridium welchii
453. About Psedomonas. All are true except________________?
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A. Strick aerobes

B. Most common organism is burn patient

C. Can grow in disinfectants in hospital

D. Infection is mostly due to endogenous source
454. The optimal time and temperature required for sterilization in an autoclave is___________________?
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A. 121C 15 mts. x 15 lbs pr.

B. 121F x 15 sec. x 15 lbs pr.

C. 140C x 2 hrs. x 10 lbs pr.

D. 121F x 15 mts. x 15 lbs pr.

455. All of the following are true of streptococcus except_____________?
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A. Most common is animals

B. Shows adherence to dental enamel

C. Its group of lactic acid production bacteria

D. Most common in humans

456. The best sterilization method for a hand-piece is________________?
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A. All of the above

B. Ethylene oxide gas

C. dry heat

D. chemical vapour

457. Vibrio cholera was discovered by_________________?
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A. Medintoff

B. Koch

C. Virchow

D. John snow

458. Thumb print appearance in culture film smear is seen______________?
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A. Brucella species

B. Clostridium weichii

C. Bordetelia pertussis

D. Bacillus anthracis

459. True about VDRL test________________?
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A. Best followed for drug therapy

B. Slide flocculation test

C. Non Specific

D. All of the above
460. The urine sample of a patient has been sent to the laboratory to look for Leptospira. The specimen is to be screened by use of the__________________?
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A. Inverted microscope

B. Electron microscope

C. Scanning microscope

D. Dark ground microscope
461. Cell wall deficient bacteria are_______________?
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A. Staphylococci

B. Mycoplasma

C. Escherichia Coli

D. Spirochetes

462. Tuberculin test screens for_____________?
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A. Hemoral immunity

B. Cell mediated immunity

C. Complement function

D. Phagocyte dysfunction

463. The predominant immunoglobulin in saliva is_______________?
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A. IgG

B. IgD

C. IgE

D. IgA
464. In initial stages of tyhoid, salmonella can be detected in________________?
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A. Blood

B. All of the above

C. Feacus

D. Urine

465. Lancefields classification of B hemolytic streptococcus is based on______________?
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A. Type of lipid in cell membrane

B. M Protein

C. Polysaccharide C antigen

D. Physiological properties

466. Detergents used to disinfect dental instruments in the office kill bacteria by interfering with functional of the cell______________?
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A. membrane

B. nucleus

C. Capsule

D. wall

467. Test for differentiating virulent form non-virulent tubercular bacilli_____________?
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A. Niacin test

B. Catalase peroxidase test

C. Aryl sulphatase test

D. Neutral red test
468. The structure in involved in bacterial attachment to cell surface is_______________?
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A. Capsule

B. Fimbria

C. Flagella

D. None of the above

469. Lepromin test is useful for________________?
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A. Epidemiology

B. Prognosis

C. Treatment plan

D. Diagnosis

470. Which regards to temperature requirement, most pathogenic bacteria are_____________?
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A. Psychrophiles

B. Cryophiles

C. Mesophiles

D. Thermophiles

471. A darkfield microscope would be useful in examining blood for_______________?
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A. Actinomyces

B. Treponema

C. Mycobacterium

D. Streptococcus

472. Malignant pustule is referred to_________________?
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A. Facio-cervical actinomycosis

B. Cutaneous anthrax

C. None of the above

D. Infected squamous cell carcinoma

473. Gram -ve bacteria stain during gram staining____________?
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A. Green

B. Red color

C. Colorless

D. Blue color

474. The causative organism for cat-scratch disease is______________?
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A. Hemophilia ducreya

B. Chlamydia trachomatis

C. Donovania granulomatis

D. Bartonella henselae
475. Rapid diagnosis of Tuberculosis is possible with_______________?
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A. Ziel Nelson

B. Kin Young stain

C. Giemsa stain

D. Auramine-Rhodamine stain
476. Which of the following is true about tetanus acquired through traumatic wound ?
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A. Causes positive Nagler reaction

B. The patient should be given tetanus toxoid intravenously

C. The tetanospasmin component of the exotoxin act on the post-synaptic neurones and prevents impulse transmission

D. Clostridium tetani travels via the nerves to the anterior horn dells in spinal cord
477. Which of the following provides best gurantee for sterlization in the heat sterilizer ?
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A. Determining the ability of a sterilizer to kill the hepatitis B virus

B. Recording a temperature/ pressure readings from sterilizer guage

C. Using a bacterial spore test

D. Using chemical indicator strip or pouch

478. What is the transport medium for cholera___________________?
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A. B & C

B. Venkatraman Ramakrishnan Medium

C. Cary Blair Medium

D. Tellurite Medium

479. Wasserman test test is diagnostic of__________________?
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A. Tyhoid

B. TB

C. Syphilis

D. Gonorrhea

480. Organism most frequently associated with urinary tract infections is_________________?
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A. Neisseria gonorrhea

B. T-strain mycoplasma

C. Escherichia coli

D. Streptococcus fecalis

481. Which of the following is an acid-fast bacillus_____________?
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A. Mycobacterium bacilli

B. Treponema pallidum

C. Neisseria gonorrhea

D. All of the above

482. The immediate type of hypersensitivity in which histamine doses not play a major role is______________?
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A. Asthma

B. Anaphylaxis

C. Urticaria

D. Arthus reaction
483. The major intestinal pathogens which are non-lactose fermenters are_________________?
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A. Klebsiella

B. Paracolons

C. Salmonella

D. Escherichia

484. One of the following is an agglutination test in the diagnosis of typhoid___________?
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A. Wasserman test

B. Mantoux test

C. Widal test

D. Eleks test

485. Endotoxins differ from exotoxins in that endotoxins______________?
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A. are highly antigenic

B. activate complement by the alternate pathway

C. are proteins

D. are heat labile

486. Among The infectious diseases transmitted by food, one is___________________?
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A. Typhoid fever

B. Viral stomatitis

C. Tuberculosis

D. Diptheria

487. The Manufacturing unit of surgical needle & sutures are sterilized by ________________?
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A. X-Rays

B. Autoclaving

C. Gamma-Rays

D. Boiling

488. Pneumococus can be differentiated from streptococcus by________________?
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A. Bile solubility

B. Gram staining

C. Growth characteristics

D. Type of hemolysis

489. The best method of sterilization of dressing powder is_____________?
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A. Tyndallization

B. Inspissation

C. Autoclaving

D. Hot air oven
490. The difference between gram positive and negative bacteria lies in their_______________?
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A. Nuclear material

B. cell membrane

C. Mesosomes

D. cell wall
491. Teichoic acid is present in cell walls of_________________?
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A. Yeast

B. Gram positive bacteria

C. Gram negative bacteria

D. Protozoa

492. Q fever is caused by________________?
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A. R. prowozekii

B. C. burnetti

C. Rickettsia tsutsugamushi

D. R. quintana

493. Exaltation is________________?
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A. No change

B. Decreased virulence

C. Increased Virulence

D. None

494. The serum concentration of which of the following human IgG subclass is maximum ?
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A. IgG1

B. IgG2

C. IgG4

D. IgG3

495. The temperature required for cultivating mycobacterium________________?
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A. 0 degree

B. 2 degree

C. 37 degrees

D. 27 degrees

496. Which of the following fulfil all the criterias of kichs postulates ?
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A. N. gonorrhoeae

B. Mycobacterium leprae

C. None of the above

D. Treponema pallidum

497. Haptane is_______________?
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A. Carrier required for specific antibody production

B. None of the above

C. High molecular protein

D. Same as epitopes

498. False +ve for VDRL is seen in______________?
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A. Yaws

B. Lepromatous Leprosy

C. All of the above

D. Malaria

499. Disinfection frees the surface from______________?
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A. Vegetative forms

B. Spore forms

C. Both of the above

D. None of the above

500. Most antibodies are produced in the________________?
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A. Thymus and the appendix

B. Brain and the meninges

C. Heart and the liver

D. Spleen and the lymph nodes