Which of the following statements is not true of most cellular redox reactions?


Question: Which of the following statements is not true of most cellular redox reactions?

The following statement is not true of most cellular redox reactions:

Cellular redox reactions are typically spontaneous.

Most cellular redox reactions are not spontaneous. They require energy input from the cell in order to proceed. This energy input is provided by ATP, which is the cell's energy currency.

Here is an example of a cellular redox reaction that is not spontaneous:

glucose + 6 O2 → 6 CO2 + 6 H2O

This reaction is not spontaneous because it is endergonic, meaning that it requires energy input. The cell provides this energy input by coupling the reaction to the hydrolysis of ATP.

Other examples of cellular redox reactions that are not spontaneous include the following:

  • The oxidation of pyruvate to acetyl CoA in the citric acid cycle
  • The reduction of NADH to NAD+ in the electron transport chain
  • The oxidation of water to oxygen and protons in the light reactions of photosynthesis

These reactions are all essential for cellular metabolism, but they would not be able to proceed without the input of energy from ATP.

Therefore, the statement "Cellular redox reactions are typically spontaneous" is not true of most cellular redox reactions.

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