Questions: TOP Microbiology MCQS

Question 451: One of the following staining methods is an example of negative staining_______________?

A Zheil-Neilson
B India ink preparation
C Fontana
D Gram

Explanation: The correct answer to the question is: India ink preparation

Question 452: All are true about widel test except________________________?

A H antigen cannot differentiate between subtypes
B High titre value in a single widal test is not confirmative
C O antibodiest last longer and hence is not indicative of recent infection
D Base lines differ depending on the endemicity of the disease

Explanation: The correct answer to the question is: O antibodiest last longer and hence is not indicative of recent infection

Question 453: The virulence factors of Neisseria gonorrhea include all of the following except____________?

A Outer membrane proteins
B IgA Protease
C M-Proteins
D Pili

Explanation: The correct answer to the question is: M-Proteins

Question 454: Characteristic feature of retrovirus is_____________?

A Ribonuclease
B Reverse transcriptase
C Restriction endonuclease
D DNA polymerase

Explanation: The correct answer to the question is: Reverse transcriptase

Question 455: Serum sickness syndrome is an example of________________?

A Cell-mediated immunity
B Systemic arthus reaction
C Anaphylactic
D Angioneurotic edema

Explanation: The correct answer to the question is: Systemic arthus reaction

Question 456: The Window period in HIV infection means______________?

A The time lapse between the infection and development of AIDS
B None of the above
C The time lapse between the infection and detection of viral antibodies
D The time lapse between obtaining the sample and detection of virus in the lab

Explanation: The correct answer to the question is: The time lapse between the infection and detection of viral antibodies

Question 457: Adjuvant given along with antigens are going to________________?

A reduce the toxigenicity
B Increase toxigenicity
C Increase antigenicity
D Reduce the antigenicity

Explanation: The correct answer to the question is: Increase antigenicity

Question 458: Which of the following is true about amoebic liver disease ?

A Left lobe of liver is commonly involved
B Trophozoites can be visualized in the pus
C Portal system is the main filtration system
D Non-suppurative form is the serious form of extra intestinal amoebiasis

Explanation: The correct answer to the question is: Trophozoites can be visualized in the pus

Question 459: Teichoic acid is present in cell walls of_________________?

A Gram negative bacteria
B Yeast
C Gram positive bacteria
D Protozoa

Explanation: The correct answer to the question is: Gram positive bacteria

Question 460: Grave

A Type I
B Type III
C Type II
D Type IV

Explanation: The correct answer to the question is: Type II

Question 461: Madura mycosis produces______________?

A Brown to black granules
B White to yellow granules
C Red granules
D No granules

Explanation: The correct answer to the question is: White to yellow granules

Question 462: 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 ?

A Francisella spp
B Brucella spp
C Bartonella spp
D Pasturella spp

Explanation: The correct answer to the question is: Brucella spp

Question 463: Confirmatory test for HIV infection is a_______________?

A ELISA
B Immunodot
C Western Blot
D RIPA

Explanation: The correct answer to the question is: Western Blot

Question 464: Rabies virus________________?

A Cytotropic
B Chromophilic
C Dermatotropic
D Neurotropic

Explanation: The correct answer to the question is: Neurotropic

Question 465: Immunoglobulin implicated in atopy and anaphylaxis is_______________?

A IgA
B IgM
C IgE
D IgG

Explanation: The correct answer to the question is: IgE

Question 466: B.C.G untrue is_____________?

A live vaccine
B Orally administered
C All of the above
D T.B vaccine

Explanation: The correct answer to the question is: Orally administered

Question 467: In penicillin allergy, penicillin acts as a_______________?

A Carrier
B Hapten
C Super antigen
D Toxin

Explanation: The correct answer to the question is: Hapten

Question 468: Thread worm is______________?

A Necator
B Enterobius
C Ancylostoma
D Ascaris

Explanation: The correct answer to the question is: Enterobius

Question 469: Endotoxin have all but one of the properties given below_______________?

A Produced by gram positive bacteria
B Cannot be toxoided
C Not secreted outside the cell
D Produced by gram negative bacteria

Explanation: The correct answer to the question is: Produced by gram positive bacteria

Question 470: The single most important laboratory test for determining the virulence of staphylococci is___________?

A Detection of coagulase
B The catalase test
C Mannitol fermentation
D Hemolysis of sheep erythrocytes

Explanation: The correct answer to the question is: Detection of coagulase

Question 471: Resistance of Staphylococcus aureus is due to ________________________?

A Elaboration of an enzyme that destroy penicillin
B Pleomorphism
C Penicillin analogue production
D Lack of nucleic acid in the cell wall

Explanation: The correct answer to the question is: Elaboration of an enzyme that destroy penicillin

Question 472: Influenza is caused by_____________?

A Paramyxo virus, which is a DNA virus
B Paramyxo virus, which is a RNA virus
C Orthomyxo virus, which is a DNA virus
D Orthomyxo virus, which is a RNA virus

Explanation: The correct answer to the question is: Orthomyxo virus, which is a RNA virus

Question 473: Normal ratio of CD4 (T4) : CD8 (T8) is_________________?

A 1:2
B 1:3
C 3:1
D 2:1

Explanation: The correct answer to the question is: 2:1

Question 474: On a stained slide, clostridium tetani has the appearance of a__________________?

A Chain of beads
B Safely pin
C Bunch of a
D Drum stick

Explanation: The correct answer to the question is: Drum stick

Question 475: Which of the following is NOT a live attenuated vaccine ?

A Varicella Zoster virus
B Typhoid
C Tuberculosis (BCG)
D Cholera

Explanation: The correct answer to the question is: Cholera

Question 476: which of the following is anaerobic_______________?

A E.coli
B Klebsiella
C Pseudomonas
D Bacteroides

Explanation: The correct answer to the question is: Bacteroides

Question 477: Amoebic liver abscess can be diagnosed by demonstratig________________?

A Trophozoites in the pus
B Cysts in the sterile pus
C Trophozoites in the feces
D Cysts in the intestine

Explanation: The correct answer to the question is: Trophozoites in the pus

Question 478: 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__________________?

A Inverted microscope
B Dark ground microscope
C Electron microscope
D Scanning microscope

Explanation: The correct answer to the question is: Dark ground microscope

Question 479: Function of Ig A is________________?

A Circulating antibody
B Activates macrophages
C Acts as a mucosal barrier for infection
D Kills virus infected cells

Explanation: The correct answer to the question is: Acts as a mucosal barrier for infection

Question 480: Aflatoxins are produced by________________?

A All of the above
B Aspergillus fumigatus
C Aspergillus flavus
D Aspergillus niger

Explanation: The correct answer to the question is: Aspergillus flavus

Question 481: The chemotactic factor is______________?

A C4a
B C2a
C C3b
D C5a

Explanation: The correct answer to the question is: C5a

Question 482: Characters of exotoxin include all, except_______________?

A Highly potent
B Heat labile
C Protein polysaccharide complex
D Has specific tissue affinity

Explanation: The correct answer to the question is: Protein polysaccharide complex

Question 483: Leptospirosis, all are true except______________?

A Faeces & urine of rodents is the cause
B Incubation period is 10 days
C Onset of IgM in 2 days
D It is sensitive to penicillin

Explanation: The correct answer to the question is: Onset of IgM in 2 days

Question 484: Which of the following belongs to cell fraction derived vaccine______________?

A Mumps
B Rubella
C Measles
D Hepatitis B

Explanation: The correct answer to the question is: Hepatitis B

Question 485: The killer cells are associated with immunologic response___________________?

A Type I
B Type II
C Type III
D Type IV