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Bacterial Pigments and Biochemical Tests Quiz

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Bacterial Pigments and Biochemical Tests Quiz

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Questions and Answers

Which of the following is an example of a water-insoluble pigment produced by nonfermenters?

Flavins

Melanins

Carotenoids (correct)

Quinones

What is the purpose of adding a layer of sterile mineral oil to one of the tubes?

To prevent bacterial growth

To create aerobic conditions

To enhance pigment production

To create anaerobic conditions (correct)

If the medium in the anaerobic tube turns yellow, what does it indicate?

The bacteria are producing pigments

The bacteria are motile

The bacteria are fermenting glucose (correct)

The bacteria are oxidizing glucose

Which pigment is described as having a violet or purple color?

Violacein Signup and view all the answers

What is the purpose of using a semisolid agar medium for testing motility?

To observe the motility of bacteria Signup and view all the answers

Which of the following is an example of a water-soluble pigment?

Pyocyanin Signup and view all the answers

What is the recommended timeframe for making an initial reading of motility in the semisolid agar medium?

Within 4 to 6 hours Signup and view all the answers

Which pigment is described as having a red or maroon color?

Phenazines Signup and view all the answers

If the tube without oil turns yellow, but the tube with oil does not, what does it indicate?

The bacteria are oxidizing glucose Signup and view all the answers

Which method is suggested as potentially more accurate for detecting motility of nonfermentative bacilli?

Hanging-drop preparation Signup and view all the answers