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in sugar fermentation labs, what does a bubble in the durham tube indicate? a. Nitrogen reduction...

in sugar fermentation labs, what does a bubble in the durham tube indicate?

a. Nitrogen reduction

b. Phenol red produced the gas

c. Gas was produced by bacterial fermentation of sugar

d. It does indicate anything important, it is just fun to see

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Answer #1

C.Gas produced by bacterial fermentation of sugar

Durhams tube are smaller than regular test tubes and are inserted upside down in another test tube. This kind of tube is used specifically to detect production of gas by microorganisms.

When microbes ferment glucose they produce carbon dioxide as well as hydrogen gases. These gases bubble up through the medium and want to escape in to the atmosphere. During this process they get trapped as bubbles in the durhams tube.

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