Which Redox Reaction(s) Will NOT Proceed as Written If the Initial

question 2

Multiple Choice

Which redox reaction(s) will NOT proceed as written if the initial concentrations of reactants and products are equal? I. pyruvate + NADH $\rightarrow$ lactate + NAD⁺
II. FADH₂ + NAD⁺ $\rightarrow$ FAD + NADH + H⁺
III. succinate + NAD⁺ $\rightarrow$ fumarate + NADH + H⁺
IV. NADH + H⁺ + ubiquinone $\rightarrow$ NAD⁺ + ubiquinol
V. cytochrome c-Fe³⁺ + cytochrome b-Fe²⁺ $\rightarrow$ cytochrome c-Fe²⁺ + cytochrome b-Fe³⁺

• A) I and IV
• B) I, IV, and V
• C) II
• D) II and III
• E) IV and V

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