Question

How should you record the reaction of carbohydrate fermentation?

A) Positive for Gas Production, Negative for Color Change
B) Positive for Color Change, Negative for Gas Production
C) Positive for Both Color Change and Gas Production
D) Negative for Both Color Change and Gas Production

Answer 1

Carbohydrate fermentation is positive if there is both a color change to yellow and gas production, hence option C) Positive for Both Color Change and Gas Production is correct.

Step-by-step explanation:

When recording the reaction of carbohydrate fermentation, it's important to observe the indicators of fermentation such as color change in the medium and the production of gas. A positive reaction for fermentation typically involves acid production, indicated by a color change to yellow due to a decrease in pH, and often gas production, which may be manifested as bubbles or a visible split in the solid growth medium. Therefore, a positive test for carbohydrate fermentation would be recorded as 'C) Positive for Both Color Change and Gas Production' if both a color change and gas production are observed.