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Most CO2 from catabolism is released duringa. glycolysis.b. the citric acid cycle.c. lactate fermentation.d. electron transport.
8. Respiration
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.
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.
Verified step by step guidance1
Understand that cellular respiration consists of three main stages: Glycolysis, the Citric Acid Cycle (Krebs Cycle), and the Electron Transport Chain (ETC).
Recognize that during Glycolysis and the Citric Acid Cycle, a small amount of ATP is produced directly, but more importantly, high-energy electron carriers NADH and FADH2 are generated.
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 through oxidative phosphorylation.
Acknowledge that CO2 is a byproduct of the Citric Acid Cycle and does not store energy for ATP production. Similarly, the H+ ions are involved in creating a proton gradient in the ETC but are not direct energy carriers.
Conclude that the potential energy for producing more ATP is stored in the high-energy electrons carried by NADH and FADH2, which are used in the Electron Transport Chain to drive ATP synthesis.
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