In Step 3 of the Citric Acid Cycle, the Oxidation

question 24

Multiple Choice

In step 3 of the citric acid cycle, the oxidation of isocitrate and the production of CO₂ are coupled to the reduction of NAD⁺, generating NADH and an α-ketoglutarate molecule.In the isocitrate molecule shown in Figure 13-32, which carbon is lost as CO₂ and which is converted to a carbonyl carbon? Figure 13-32

• A)4 and 6
• B)6 and 5
• C)5 and 4
• D)6 and 4

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