| 46. | Mac-Conkey medium is an example of |
| a. | transport medium |
| b. | enrichment medium |
| c. | differential medium |
| d. | all of these |
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Answer: (c).differential medium
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| 47. | Pseudomonas aeruginosa forms a blue water soluble pigment called |
| a. | pyocyanin |
| b. | chlororaphin |
| c. | pyoverdin |
| d. | β-carotene |
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Answer: (a).pyocyanin
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| 48. | Agar is used for solidifying culture media because |
| a. | it does not affect by the growth of bacteria |
| b. | it does not add to the nutritive properties of the medium |
| c. | the melting and solidifying points of agar solution are not the same |
| d. | all of the above |
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Answer: (d).all of the above
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| 49. | For the selection of lactobacilli present in cheddar cheese, the pH of the medium is maintained at |
| a. | 6.35 |
| b. | 5.35 |
| c. | 4.35 |
| d. | 5.75 |
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Answer: (b).5.35
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| 50. | A disease producing species occurring in a mixed culture can often be selected on the basis of its |
| a. | pathogenic properties |
| b. | special carbon source |
| c. | special nitrogen source |
| d. | none of these |
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Answer: (a).pathogenic properties
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