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Identification of Bacteria MCQ Questions & Answers

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

Which of the following(s) show(s) positive results for phenylalanine deaminase test?

A. Providencia
B. Proteus
C. Morganella
D. All of these

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Question 2

What is the colour of gram -postive bacteria on a gram staining?

A. Purple
B. Pink
C. Colourless
D. Green

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Question 3

The gram-negative organisms is

A. Actinomyces
B. Bacillus
C. Clostridium
D. None of these

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Question 4

Which of the following shows a positive urease test?

A. Proteus
B. Klebsiella
C. Both (a) and (b)
D. None of these

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Question 5

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

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Question 6

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

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Question 7

The organisms that can be acid-fast stained is

A. Nocardia
B. Tubercle bacilli
C. Lepra bacilli
D. all of these

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Question 8

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

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Question 9

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

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Question 10

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

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Question 11

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

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Question 12

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

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Question 13

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

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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

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Question 15

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

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Question 16

Gram staining was developed accidentally in 1884 by

A. Alexander Fleming
B. Hans Christian Gram
C. Joseph Christian Gram
D. Robert Gram

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Question 17

Which of the following organisms can be demonstrated with silver impregnation method?

A. Vibrios
B. Salmonella
C. Spirochaetes
D. Shigella

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Question 18

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

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Question 19

Catalase production is negative in which of the following?

A. Streptococcus
B. Salmonella
C. Proteus
D. Staphylococcus

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Question 20

Which of the following shows a positive urease test?

A. Proteus
B. Klebsiella
C. Both A and B
D. None of these

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Question 21

Which of the following(s) is/ are oxidase-positive bacteria?

A. Vibrio
B. Neisseria
C. Pseudomonas
D. All of the above

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Question 22

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

View Answer

Question 23

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

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Question 24

What is the colour of gram-negative bacteria on a gram staining?

A. Purple
B. Pink
C. Green
D. Colourless

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Question 25

Which of the following(s) is/ are oxidase-positive bacteria?

A. Vibrio
B. Neisseria
C. Pseudomonas
D. All of these

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Question 26

The primary stain of Gram's method is

A. safranin
B. phenolpthalene
C. crystal violet
D. methyl red

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Question 27

The organisms that can be acid-fast stained is

A. Nocardia
B. Tubercle bacilli
C. Lepra bacilli
D. All of the above

View Answer