Aerobic respiration and fermentation ________.
A) evolved in different living organisms to utilize energy stored in glucose with equal efficiency
B) occur only in animal cells because plants carry out photosynthesis
C) utilize fat as primary energy source
D) occur at the same rate throughout all cells of the body
E) start with glycolysis.

Question

Aerobic respiration and fermentation ________.  
A) evolved in different living organisms to utilize energy stored in glucose with equal efficiency
B) occur only in animal cells because plants carry out photosynthesis
C) utilize fat as primary energy source
D) occur at the same rate throughout all cells of the body
E) start with glycolysis.

Quizplus · Accepted Answer

Both aerobic respiration and fermentation start with glycolysis, which breaks down glucose into two molecules of pyruvate. From there, aerobic respiration continues in the presence of oxygen to further break down pyruvate and generate a large amount of ATP, while fermentation occurs in the absence of oxygen and only produces a small amount of ATP through alternative pathways. Evolutionary origins and occurrence in different organisms, primary energy sources, and rates of occurrence are not directly related to the fundamental similarities between aerobic respiration and fermentation in starting with glycolysis.

Aerobic Respiration and Fermentation ________