Microbial Stains

 

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Microbial Stains

Question 1
Which of the following is the example of Gram-negative bacteria?
A
Lactobacillus
B
Eschericia coli
C
Staphylococcus aureus
D
Bacillus subtilis

Question 2
What is the correct order of staining reagents in Gram-Staining?
A
Crystal violet, alcohol, iodine solution, safranin
B
Crystal violet, iodine solution, alcohol, safranin
C
Crystal violet, safranin, alcohol, iodine solution
D
Iodine solution, crystal violet, alcohol, safranin

Question 3
Which of the staining technique helps in demonstrating spore structure in bacteria as well as free spores?
A
Acid-fast stain
B
Endospore stain
C
Capsule stain
D
Flagella stain

Question 4
Gram-positive bacteria are usually more susceptible to?
A
streptomycin
B
tetracyclin
C
penicillin
D
ampicillin

Question 5
Which of the following are true for Gram-negative bacteria?
A
upon alcohol treatment, the permeability of the cell wall increases
B
crystal violet-iodine (CV-I) complex is extracted
C
pore size decreases and the CV-I complex cannot be extracted
D
alcohol treatment increases the permeability of the cell wall and the CV-I complex can be extracted

Question 6
In Gram-staining, iodine is used as a.....
A
fixative
B
mordant
C
solublizer
D
stain

Question 7
Which bacteria appears purple-violet colour after staining?
A
Gram-positive
B
Gram-negative
C
Both Gram-positive and Gram-negative
D
Neither Gram-positive nor Gram-negative

Question 8
The dye eosinate of methylene blue belongs to which group?
A
Acidic dye
B
Basic dye
C
Neutral dye
D
Oxazine dye
There are 8 questions to complete.

 

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