Multiple Choice
Water is one of the products of aerobic cellular respiration. What is the source of the oxygen atom utilized to create the water molecules?
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3. Energy & Cell Processes
Review of Aerobic Cellular Respiration
Multiple Choice
During aerobic respiration, molecular oxygen (O2) is used for which of the following purposes?
A
At the end of glycolysis to oxidize pyruvate
B
At the end of the citric acid cycle to regenerate citric acid
C
Between glycolysis and the citric acid cycle to split a carbon from pyruvate, producing CO2
D
As a source of O2 in every reaction that produces CO2
E
At the end of the electron transport chain to accept electrons and form H2O
Verified step by step guidance1
Understand the role of oxygen in aerobic respiration: Oxygen is crucial in the final stage of aerobic respiration, known as the electron transport chain (ETC).
Identify the stages of aerobic respiration: Glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain are the main stages.
Recognize that oxygen is not used in glycolysis or the citric acid cycle: These stages do not require oxygen directly; instead, they produce molecules that carry electrons to the ETC.
Focus on the electron transport chain: In the ETC, electrons are transferred through a series of proteins, and oxygen acts as the final electron acceptor.
Explain the formation of water: When oxygen accepts electrons at the end of the ETC, it combines with protons (H+) to form water (H2O), completing the process of aerobic respiration.
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