Why phenol red is added to the fermentation broth tube


Problem:  Why phenol red is added to the fermentation broth tube and why the carbohydrate fermentation test is used?

The purpose of high salt in mannitol salt agar and the purpose of eosin and methylene blue dyes in eosin methylene blue agar tubes?

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Biology: Why phenol red is added to the fermentation broth tube
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