Identification of Bacteria MCQs : This section focuses on the "Identification of Bacteria". These Multiple Choice Questions (MCQs) should be practiced to improve the Identification of Bacteria skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
The gram-negative organisms is
A. Actinomyces
B. Bacillus
C. Clostridium
D. None of these
Question 2
Catalase production is negative in which of the following?
A. Streptococcus
B. Salmonella
C. Proteus
D. Staphylococcus
Question 3
Which of the following is a substitute for crystal violet used in gram-staining procedure?
A. Methylene blue
B. Bromocresol green
C. Safranin
D. Phenolpthalene
Question 4
Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?
A. Blue colour
B. Appearance of growth
C. Both A and B
D. None of the above
Question 5
The organisms that can be acid-fast stained is
A. Nocardia
B. Tubercle bacilli
C. Lepra bacilli
D. All of the above
Question 6
The primary stain of Gram's method is
A. safranin
B. phenolpthalene
C. crystal violet
D. methyl red
Question 7
At what concentration of sulphuric acid, Nocardia resists decolourization?
A. 0.5% sulphuric acid
B. 5% sulphuric acid
C. 10% sulphuric acid
D. 8% sulphuric acid
Question 8
Which of the following is commonly used as Gram's decolouriser?
A. Ethyl alcohol
B. Methyl alcohol
C. Acetone
D. A mixture of ethyl alcohol and acetone
Question 9
Production of acetoin can be detected by which of the following tests?
A. Citrate test
B. Voges-Proskauer test
C. Methyl red test
D. Indole test
Question 10
The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it?
A. Indole test
B. Methyl red test
C. Citrate utilization test
D. Voges-Proskauer test
Question 11
What is the colour of gram -postive bacteria on a gram staining?
A. Purple
B. Pink
C. Colourless
D. Green
Question 12
What is the colour of gram-negative bacteria on a gram staining?
A. Purple
B. Pink
C. Green
D. Colourless
Question 13
Which of the following is a primary stain for acid fast staining of mycobacteria?
A. Crystal violet
B. Carbol fuchsin
C. Geimsa
D. Methylene blue
Question 14
The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to
A. radiation
B. desiccation
C. Both A and B
D. extreme temperatures
Question 15
Which of the following shows a positive urease test?
A. Proteus
B. Klebsiella
C. Both A and B
D. None of these
Question 16
Which of the following(s) is/ are oxidase-positive bacteria?
A. Vibrio
B. Neisseria
C. Pseudomonas
D. All of the above
Question 17
What is the order of reagents used in the Gram stain?
A. Crystal violet, iodine, safranin, decolorizer
B. Crystal violet, iodine, decolorizer, safranin
C. Safranin, crystal violet, decolorizer, iodine
D. Crystal violet, safranin, iodine, decolorizer
Question 18
Gram staining was developed accidentally in 1884 by
A. Alexander Fleming
B. Hans Christian Gram
C. Joseph Christian Gram
D. Robert Gram
Question 19
Which of the following organisms can be demonstrated with silver impregnation method?
A. Vibrios
B. Salmonella
C. Spirochaetes
D. Shigella
Question 20
Which of the following(s) show(s) positive results for phenylalanine deaminase test?
A. Providencia
B. Proteus
C. Morganella
D. All of these
Question 21
The process of Gram staining is based on the ability of bacterial cell wall
A. to retain the safranin dye
B. to retain the crystal violet dye during solvent treatment
C. to retain part of both dyes
D. None of the above
Question 22
The deinococci are gram-positive cocci and rods that are distinctive in their unusually great resistance to
A. radiation
B. desiccation
C. both (a) and (b)
D. extreme temperatures
Question 23
The organisms that can be acid-fast stained is
A. Nocardia
B. Tubercle bacilli
C. Lepra bacilli
D. all of these
Question 24
The process of Gram staining is based on the ability of bacterial cell wall
A. to retain the safranin dye
B. to retain the crystal violet dye during solvent treatment.
C. to retain part of both dyes
D. none of above
Question 25
Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?
A. Blue colour
B. Appearance of growth
C. Both (a) and (b)
D. None of these
Question 26
Which of the following shows a positive urease test?
A. Proteus
B. Klebsiella
C. Both (a) and (b)
D. None of these
Question 27
Which of the following(s) is/ are oxidase-positive bacteria?
A. Vibrio
B. Neisseria
C. Pseudomonas
D. All of these