Question

a student adds yeast cells to a flask of liquid media containing glucose. the flask is sealed and allowed to sit for a period of time. what substance would increase if the yeast cells are performing fermentation? a water b oxygen c alcohol d glucose

Explanation:

Yeast cells perform alcoholic fermentation in the absence of oxygen. The chemical equation for alcoholic fermentation is \(C_6H_{12}O_6
ightarrow2C_2H_5OH + 2CO_2\). So, alcohol (\(C_2H_5OH\)) is produced. Water is a by - product of aerobic respiration (not fermentation in this context). Oxygen is consumed in aerobic respiration and not produced in fermentation. Glucose is the starting substrate for fermentation and is consumed, not increased.

Answer:

C. alcohol