Multiple Choice
Identify the reaction that involves an isomerization reaction between the substrate and product.
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- 1. A Review of General Chemistry5h 6m
- Summary23m
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- Intro to Citric Acid Cycle7m
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- 34. Nucleic Acids1h 32m
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33. The Organic Chemistry of Metabolic Pathways
Structures of the Citric Acid Cycle
Multiple Choice
Which reactions of the citric acid cycle involve a decarboxylation?
A
Reactions 1 and 2
B
Reactions 2 and 4
C
Reactions 3 and 4
D
Reactions 3, 4, and 7
E
Reactions 2, 5, and 6
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Verified step by step guidance1
Understand the concept of decarboxylation: Decarboxylation is a chemical reaction that removes a carboxyl group and releases carbon dioxide (CO₂). In the context of the citric acid cycle, it involves the conversion of a substrate into a product with one less carbon atom, releasing CO₂.
Review 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. It involves eight main steps, each catalyzed by a specific enzyme.
Identify the reactions in the citric acid cycle that involve decarboxylation: In the citric acid cycle, decarboxylation occurs during the conversion of isocitrate to α-ketoglutarate and the conversion of α-ketoglutarate to succinyl-CoA. These are the third and fourth reactions in the cycle.
Analyze the options given: Compare the reactions identified in the previous step with the options provided in the problem. The correct answer should match the reactions where decarboxylation occurs.
Conclude with the correct answer: Based on the analysis, the reactions that involve decarboxylation in the citric acid cycle are the third and fourth reactions. Therefore, the correct answer is 'Reactions 3 and 4'.
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