MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is the example of Gram-negative bacteria? |
| A. | Lactobacillus |
| B. | Eschericia coli |
| C. | Staphylococcus aureus |
| D. | Bacillus subtilis |
| Answer» C. Staphylococcus aureus | |
| 2. |
In Gram-staining, iodine is used as a ______________ |
| A. | fixative |
| B. | mordant |
| C. | solublizer |
| D. | stain |
| Answer» C. solublizer | |
| 3. |
Which of the following is the example of Gram-negative bacteria? |
| A. | Lactobacillus |
| B. | Eschericia coli |
| C. | Staphylococcus aureus |
| D. | Bacillus subtilis |
| Answer» C. Staphylococcus aureus | |
| 4. |
In Gram-staining, iodine is used as a______________ |
| A. | fixative |
| B. | mordant |
| C. | solublizer |
| D. | stain |
| Answer» C. solublizer | |
| 5. |
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 |
| Answer» C. Capsule stain | |
| 6. |
Gram-positive bacteria are usually more susceptible to? |
| A. | streptomycin |
| B. | tetracyclin |
| C. | penicillin |
| D. | ampicillin |
| Answer» D. ampicillin | |
| 7. |
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 |
| Answer» E. | |
| 8. |
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 |
| Answer» B. Gram-negative | |
| 9. |
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 |
| Answer» C. Crystal violet, safranin, alcohol, iodine solution | |
| 10. |
The dye eosinate of methylene blue belongs to which group? |
| A. | Acidic dye |
| B. | Basic dye |
| C. | Neutral dye |
| D. | Oxazine dye |
| Answer» D. Oxazine dye | |