Answer:
Fermentation of Sugars
Step-by-step explanation:
KIA contains both glucose and lactose as carbohydrate sources. Microbes are inoculated onto the medium, and their ability to ferment these sugars is observed. If a microbe can ferment glucose, it produces acid, turning the medium yellow in the butt (lower portion of the tube). If lactose fermentation occurs, the acid production continues, turning the entire medium yellow.