Textbook Question
In which of the following is the first molecule becoming reduced to the second molecule?a. pyruvate → acetylCoAb. pyruvate → lactatec. glucose → pyruvated. NADH + H+ →NAD+ + 2H
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3. Energy & Cell Processes
Fermentation & Anaerobic Respiration
Multiple Choice
Which of the following is formed when oxygen debt occurs during anaerobic respiration in muscle cells?
A
Carbon dioxide
B
Lactic acid
C
Acetyl-CoA
D
Ethanol
Verified step by step guidance1
Understand the concept of anaerobic respiration: In muscle cells, when oxygen is scarce, they switch from aerobic to anaerobic respiration to produce energy.
Identify the byproducts of anaerobic respiration: Unlike aerobic respiration, which produces carbon dioxide and water, anaerobic respiration in muscle cells leads to the formation of lactic acid.
Recognize the role of oxygen debt: Oxygen debt occurs when the body uses anaerobic respiration due to insufficient oxygen, leading to the accumulation of lactic acid in the muscles.
Differentiate between the options: Carbon dioxide is a byproduct of aerobic respiration, acetyl-CoA is an intermediate in aerobic metabolism, and ethanol is a byproduct of anaerobic respiration in yeast, not in human muscle cells.
Conclude that lactic acid is the correct answer: During anaerobic respiration in muscle cells, lactic acid is formed as a result of oxygen debt.
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