The Following Reaction Is One Step in the Key Metabolic

Multiple Choice

The following reaction is one step in the key metabolic pathway called the TCA (or Krebs) cycle. This reaction is missing a reactant (A) which reacts to form a product (B) . What is the identity of A and B?

A) A is NAD⁺ and B is NADH + H⁺.
B) A is FAD and B is FADH₂.
C) A is NADH + H⁺ and B is NAD⁺.
D) A is FADH₂ and B is FAD.
E) Actually, there is no A, but B is H₂.