6. Which of the following best describes the Gram stain reaction and the colony

Question

6. Which of the following best describes the Gram stain reaction and the colony morphology for Bacterium A? a) Gram negative rod-shaped bacterium b) Gram negative coccus-shaped bacterium c) Gram positive rod-shaped bacterium d) Gram positive coccus-shaped bacterium e None of the above 7. Which of the following bacterial species has the same Gram reaction and cell morphology as Bacterium A? a) Streptomyces coelicor b) Escherichia coli c) Neisseria meningitidis d) Bacilus subtilis Staphylococcus aureus Which of the following best describes the Gram stain reaction and the colony morphology for Bacterium B? a) Gram negative rod-shaped bacterium b) Gram negative coccus-shaped bacterium c Gram positive rod-shaped bacterium d) Gram positive coccus-shaped bacterium e None of the above 8. . Which of the following bacterial species has the same Gram reaction and cell morphology as Bacterium B? a) Streptomyces coelicolor b) Escherichia coli c) Neisseria meningitidis d) Bacillus subtilis Staphylococcus aureus 10. Which of the following mic roscopy approaches or stains would you use to stain visualize bacterial endospores? a) Gram stain b) Hanging drop microscopy c Confocal microscopy d) Bromophenol blue stain e Malachite green stain

Explanation / Answer

6.For bacterium A, the Gram stain reaction is negative and the colony morphology is rod shaped bacterium.

So, correct option is (a).

7.Among the following species, only Escherichia coli is gram negative and rod shaped both.

So, option (b) is correct.

8.For bacterium B, the Gram reaction is positive and the cell morphology is rod-shaped.

So, correct option is (c).

9.Among the following species, only Bacillus subtilis is Gram positive and rod shaped both.

So, correct option is (d).

10.To visualize bacterial endospores, Malachite green stain is used in which the endospores stain green and the vegetative cells stain pink.

So, correct option is (e).

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