교과서 질문
In step 3 of the citric acid cycle, the enzyme isocitrate dehydrogenase is regulated by NADH. Compare and contrast the regulation of this enzyme with the regulation of phosphofructokinase in glycolysis.
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8. Respiration
Krebs Cycle
객관식
Which of the following correctly describes the flow of energy in the citric acid cycle?
A
Energy is primarily stored in the form of glucose.
B
Energy is primarily released as heat.
C
Energy is primarily captured in the form of ATP directly.
D
Energy is primarily captured in the form of NADH and FADH2.
검증된 단계별 안내1
Begin by understanding the citric acid cycle, also known as the Krebs cycle, which is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.
Recognize that the main purpose of the citric acid cycle is to produce high-energy electron carriers, NADH and FADH2, which are crucial for the electron transport chain where most ATP is generated.
Identify that during the cycle, acetyl-CoA is oxidized, and in the process, electrons are transferred to NAD+ and FAD, forming NADH and FADH2. These molecules store energy in the form of high-energy electrons.
Understand that while ATP is produced directly in the citric acid cycle, it is not the primary form of energy capture. The cycle generates only a small amount of ATP directly through substrate-level phosphorylation.
Conclude that the correct description of energy flow in the citric acid cycle is that energy is primarily captured in the form of NADH and FADH2, which are then used in the electron transport chain to produce ATP.
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