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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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24. Metabolism and Nutrition
Review of Aerobic Cellular Respiration
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Through the first three stages of cellular respiration only 4 ATP molecules have been produced from the initial glucose molecule. In which of the products of these stages is the potential energy to produce more ATP molecules stored?
A
The 6 molecules of CO2.
B
The H+ ions produced.
C
The 10 NADH and 2 FADH2 molecules.
D
The 4 molecules of ATP.
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Begin by understanding the process of cellular respiration, which consists of glycolysis, the citric acid cycle (Krebs cycle), and oxidative phosphorylation. Each stage plays a role in energy production.
Recognize that glycolysis and the citric acid cycle produce a small amount of ATP directly, but their main function is to generate electron carriers, specifically NADH and FADH2.
Identify that NADH and FADH2 are crucial because they carry high-energy electrons to the electron transport chain, where the majority of ATP is produced during oxidative phosphorylation.
Understand that the electron transport chain uses the electrons from NADH and FADH2 to pump H+ ions across the mitochondrial membrane, creating a gradient that drives ATP synthesis through chemiosmosis.
Conclude that the potential energy for producing more ATP is stored in the NADH and FADH2 molecules, as they are key to driving the electron transport chain and subsequent ATP production.
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