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Question
Biology
Posted 9 months ago
Litmus Milk is a complex medium, so we will have several questions regarding this test.
How can we visualize fermentation of lactose in Litmus Milk?
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Answer from Sia
Posted 9 months ago
Answer
To visualize the fermentation of lactose in Litmus Milk, you can observe several key changes in the medium.
Solution
a
Color Change: The litmus indicator in the milk will change color based on the pH. If lactose fermentation occurs, acid is produced, lowering the pH and turning the medium pink
b
Coagulation: Acid production can lead to the coagulation of casein, resulting in a curd formation
c
Gas Production: Some bacteria produce gas during fermentation, which can be observed as cracks or bubbles in the curd
Key Concept
Lactose fermentation in Litmus Milk is indicated by a color change, coagulation, and gas production.
Explanation
The fermentation of lactose by bacteria produces acid, which lowers the pH and changes the color of the litmus indicator to pink. Acid production can also cause casein to coagulate, forming a curd. Some bacteria may produce gas, visible as cracks or bubbles in the curd.
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