Is my answer correct? If not, please elaborate. Question: Contrary to glucose fe

Question

Is my answer correct? If not, please elaborate.

Question: Contrary to glucose fermentation tubes with Durham tubes, where you can see the production of gas as a bubble, how do we know if gas was produced inside a lactose or sucrose fermentation broth without a Durham tube inside?

My Answer:

We know gas was produced in the lactose and sucrose broth if the tube changed from red to yellow. gas is a byproduct of glucose fermentation, and lactose and sucrose are polysaccharides that are later broken down into glucose and another monomer. If color change from red-yellow is indicative of fermentation, then subsequently gas was produced in the lactose and sucrose broths as well.

Explanation / Answer

No, your answer is incorrect. Durham tube is used to capture gas, so that we can observe the presence or absence of gas inside the tube. It is highly impossible to detect the presence of gas without Durham tube. pH indicators are used to check for the accumulation of acid or alkaline products after fermentation.

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