In Step 3 of the Citric Acid Cycle, the Oxidation

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