| 46. | 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 |
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Answer: (b).Endospore stain
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| 47. | In Gram-staining, iodine is used as a______________ |
| a. | fixative |
| b. | mordant |
| c. | solublizer |
| d. | stain |
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Answer: (b).mordant
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| 48. | Which of the following is the example of Gram-negative bacteria? |
| a. | Lactobacillus |
| b. | Eschericia coli |
| c. | Staphylococcus aureus |
| d. | Bacillus subtilis |
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Answer: (b).Eschericia coli
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| 49. | In which of the following situations will the logarithmic plot of survivors be constant? |
| a. | physiological conditions are different |
| b. | cells of microbial population vary in size |
| c. | age and physiological conditions are uniform |
| d. | temperature conditions are different |
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Answer: (c).age and physiological conditions are uniform
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| 50. | A suspension of E.coli exposed to a heat treatment may yield a greater number of survivors if a plating medium of _____________ is used. |
| a. | peptone |
| b. | trypticase soy agar |
| c. | deoxycholate agar |
| d. | potato dextrose |
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Answer: (b).trypticase soy agar
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