Multiple Choice
Can energy be harvested by cells from glucose without the presence of oxygen, and if so, what process is primarily responsible for this?
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8. Respiration
Fermentation & Anaerobic Respiration
Multiple Choice
Which end product of fermentation causes the burning feeling in muscles that are working hard?
A
Ethanol
B
Acetaldehyde
C
Lactic acid
D
Carbon dioxide
Verified step by step guidance1
Understand the process of fermentation: Fermentation is an anaerobic process that allows cells to produce energy without oxygen. It occurs in muscle cells during intense exercise when oxygen is scarce.
Identify the types of fermentation: There are two main types of fermentation relevant to biology: alcoholic fermentation and lactic acid fermentation. Alcoholic fermentation produces ethanol and carbon dioxide, while lactic acid fermentation produces lactic acid.
Focus on lactic acid fermentation: During strenuous exercise, muscle cells switch to lactic acid fermentation to generate ATP. This process converts pyruvate, a product of glycolysis, into lactic acid.
Recognize the effects of lactic acid: The accumulation of lactic acid in muscles can lead to a burning sensation and fatigue. This is because lactic acid lowers the pH in muscle cells, affecting enzyme activity and causing discomfort.
Conclude with the end product: The burning feeling in muscles during intense exercise is primarily due to the accumulation of lactic acid, which is the end product of lactic acid fermentation.
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