In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of ________.
A) ATP, CO2, and ethanol (ethyl alcohol)
B) ATP, CO2, and lactate
C) ATP, NADH, and pyruvate
D) ATP, pyruvate, and oxygen
E) ATP, pyruvate, and acetyl CoA

Question

Quizplus · Accepted Answer

In the absence of oxygen, yeast cells undergo anaerobic respiration, also known as fermentation. In this process, glucose is broken down into pyruvate through glycolysis, producing a small amount of ATP and NADH. The pyruvate is then converted to ethanol (ethyl alcohol) and carbon dioxide (CO2) by the yeast cells, regenerating NAD+ for glycolysis to continue. Therefore, the correct answer is A because yeast cells produce ATP, CO2, and ethanol through fermentation in the absence of oxygen.

In the Absence of Oxygen, Yeast Cells Can Obtain Energy