How does yeast help to make bread?
The yeast cells feed on the sugar in the dough called glucose. They can use anaerobic respiration to get energy for themselves from the glucose. In this process the yeast makes alcohol and carbon dioxide. The kind of alcohol the yeast makes is called ethanol. Glucose makes ethanol and carbon dioxide is the word equation for this process otherwise called fermentation. The carbon dioxide fills the bread dough with bubbles and makes it rise.
