microbiology MCQs – Page 22

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

microbiology Mcqs

421. Toxic shock syndrome is due to the following virulence factor_____________?
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A. Carbohydrate cell wall

B. Pyrogenic exotoxin

C. M protein

D. Streptolysin 0

422. Signs of tyhoid fever is/are_____________________?
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A. Haemorrhage

B. All of the above

C. perforation

D. Osteomyelitis

423. In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by_____________?
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A. Widal test

B. Urine culture

C. Blood culture

D. Stool culture

424. Each of the following can cause food poisoning except________________?
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A. Cl. welchii

B. Cl. difficile

C. Cl. botulinum

D. Staphylococcus

425. IL-1 is produced by_________________?
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A. Helper B cells

B. Helper T cells

C. Monocytes

D. Macrophages

426. A veterinary doctor had pyrexia of unknown origin His blood culture in special laboratory media was positive for gram negative short bacilli which was oxidase positive. Which one of the following is the likely organism grown in culture ?
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A. Francisella spp

B. Pasturella spp

C. Bartonella spp

D. Brucella spp

427. Operation theatres are sterilized by_____________?
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A. ETO gas

B. Carbolic acid spraying

C. Washing with soap and water

D. Formaldehyde fumigation

428. Organ of locomotion in bacteria is________________?
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A. Fimbria

B. Cell wall

C. Flagella

D. Capsule

429. Which of the following are correctly matched ?
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A. Antigenic stimulus given by vaccine (polio) is artificial active immunity

B. All of the above

C. Injection of antibodies (Hepatitis) is artificially acquired passive immunity

D. Transfer of antibody from mother to child is through colostrum and acquired passive immunity naturally

430. All of the following organisms are known to survive intracellularly except_____________?
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A. Legionella pneumophila

B. Salmonella typhi

C. Neisseria meningitides

D. Streptococcus pyogenes

431. The most common site where organisms are present in a typhoid carrier is______________?
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A. Gall Bladder

B. Salivary gland

C. Liver

D. Spleen

432. Bacteria acquire characteristics by all of the following except___________________?
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A. Through bacteriophages

B. through conjugation

C. Incorporating part of host DNA

D. Though plasmids

433. Bacterial species which is protective or beneficial to the host is_______________?
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A. Treponema denticola

B. Spirochetes

C. Streptococcus sanguis

D. Porphyromonas gingivalis

434. All are true about bordetella pertussis except______________?
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A. It may occur in children and young adult after vaccination

B. Bacteria culture from nasopharyngeal swab is the definitive diagnosis

C. Most common cause is B. Petrussis

D. Presence of antibodies in serum in diagnostic of the disease

435. The type of immunoglobulin most commonly increased in multiple myeloma is_______________?
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A. IgA

B. IgM

C. IgD

D. IgG

436. Chlamydia causes all of the following except________________?
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A. Parotitis

B. Pneumonia

C. Trachoma

D. Non-gonococcal urethritis

437. A protoplast is best characterized as a bacterial cell______________?
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A. Free of a cell wall and a capsule

B. Uniquely sensitive to penicillin

C. with a cell wall but free of a capsule

D. containing a cell wall and a capsule

438. For uniform staining reaction, morphology and biochemical activity it is advisable to study bacterial cultures during the_____________?
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A. Logarithmic phase

B. Lag phase

C. Stationary phase

D. Death phase

439. Grape bunch shaped colonies are seen in______________?
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A. E.coli

B. Gonococci

C. Staphylococcus

D. Streptococcus

440. Mycobacterium tuberculosis is best demonstrated by_________________?
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A. Ziehl-Neelsen stain

B. H & E stain

C. Grams stain

D. PAS stain

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