12. What is the purpose of fermentation to the yeast cells? What are the starting material, useful products (for

the yeast), and waste products?

Here's ur answer

Explanation:

The purpose of fermentation in yeast is the same as that in muscle and bacteria, to replenish the supply of NAD + for glycolysis, but this process occurs in two steps: Alcoholic fermentation consists of pyruvate being first converted into acetaldehyde by the enzyme pyruvate decarboxylase and releasing CO2.