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What are the phenol red broth color indicators and why?
yellow - acidic
orange- neutral
red - basic
What are fermentation tests especially useful for distinguishing?
differentiating gram-neg bacilli, especially enterobacteria
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
Could an obligate aerobe ferment?
No, obligate aerobes require oxygen for growth and do not ferment.
What type of metabolism does positive for fermentation of sugars indicate?
use fermentation, not oxidative