Multiple Choice
Which of the following processes generates most of the NADH that delivers electrons to the electron transport chain?
8. Respiration
Krebs Cycle
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After completion of the citric acid cycle, most of the usable energy from the original glucose molecule is in the form of __________.
A
acetyl CoA
B
ATP
C
CO2
D
FADH2
E
NADH
Verified step by step guidance1
Begin by understanding the role of the citric acid cycle in cellular respiration. The citric acid cycle, also known as the Krebs cycle, 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.
Identify the main products of the citric acid cycle. The cycle produces carbon dioxide (CO2), ATP, and reduced forms of electron carriers, specifically NADH and FADH2.
Recognize that the citric acid cycle is primarily involved in the production of electron carriers. These carriers, NADH and FADH2, are crucial for the next stage of cellular respiration, the electron transport chain, where they are used to generate ATP.
Understand that while ATP is produced directly in the citric acid cycle, the majority of the energy is stored in the form of NADH and FADH2. These molecules carry high-energy electrons to the electron transport chain.
Conclude that after the completion of the citric acid cycle, most of the usable energy from the original glucose molecule is stored in the form of NADH, which will be used in the electron transport chain to produce ATP.
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