Question

In the dough, yeast helps to
transform starch and sugars in the
flour. A chemical reaction occurs
during which carbon dioxide and
alcohol form. Where do the carbon
atoms that are present in carbon
dioxide and alcohol come from?

Answer 1

Answer:

when the yeast transforms starch and sugars into flour it breaks down sugar into carbon dioxide and ethanol .

I.e C6H12O6 --------------> CO2 + C2H3OH

glucose yeast carbon ethenol

dioxide

therefore we can conclude that the CO2 exerted by yeasts is produced by breaking down of glucose molecules.

Explanation:

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