2 - Fermentation of carbohydrates

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5 Terms

1
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What are the phenol red broth color indicators and why?

  • yellow - acidic

  • orange- neutral

  • red - basic

2
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What are fermentation tests especially useful for distinguishing?

differentiating gram-neg bacilli, especially enterobacteria

3
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What is a yellow/acidic broth a sign of in fermentation of carbs tests in phenol red broth?

organsims are fermenting sugar and raising the pH

4
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Could an obligate aerobe ferment?

No, obligate aerobes require oxygen for growth and do not ferment.

5
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What type of metabolism does positive for fermentation of sugars indicate?

use fermentation, not oxidative