Why a microbe may give a faint-yellow result

1. Explain why a microbe may give a faint-yellow result with a glucose test and a bright yellow result for a maltose test if both tests were made to the same concentration.

2. Design a media to determine if a bacterium could ferment arabinose to an acid product and or produce gas.

3. If an organism does not ferment sugars to an acid or gas, but instead uses respiration only, explain why the tubes will slowly turn yellow over the course of 1-2 weeks.

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