Multiple Choice
Which one of the following substances is a part of both phases A and C of the citric acid cycle?
33. The Organic Chemistry of Metabolic Pathways
The Citric Acid Cycle
Multiple Choice
Which reaction of the citric acid cycle produces NADH from the choices provided?
A
Reaction 3
B
Reaction 5
C
Reaction 2
D
Reaction 6
E
Reaction 1
F
None of these
Verified step by step guidance1
Understand the citric acid cycle: The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats, and proteins into carbon dioxide.
Identify the reactions that produce NADH: In the citric acid cycle, NADH is produced in specific steps where NAD+ is reduced to NADH. These steps are catalyzed by dehydrogenase enzymes.
Recall the specific reactions: The reactions in the citric acid cycle that produce NADH are: isocitrate to α-ketoglutarate (catalyzed by isocitrate dehydrogenase), α-ketoglutarate to succinyl-CoA (catalyzed by α-ketoglutarate dehydrogenase), and malate to oxaloacetate (catalyzed by malate dehydrogenase).
Match the reactions to the choices: Compare the reactions that produce NADH with the options provided in the problem to determine which reaction corresponds to the production of NADH.
Select the correct reaction: Based on the knowledge of the citric acid cycle and the reactions that produce NADH, identify the correct reaction number from the choices given.
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