In biological cells that have a plentiful supply of , glucose is oxidized completely to and by a process called aerobic oxidation. Muscle cells may be deprived of during vigorous exercise and, in that

Question

In biological cells that have a plentiful supply of $O_2$, glucose is oxidized completely to $CO_2$ and $H_2O$ by a process called aerobic oxidation. Muscle cells may be deprived of $O_2$ during vigorous exercise and, in that case, one molecule of glucose is converted to two molecules of lactic acid, CH3CH(OH)COOH, by a process called anaerobic glycolysis.
C6H12O6(s) + 6$O_2$(g) → 6$CO_2$(g) + 6$H_2O$(l); ΔH° = -2880 kJ/mol
C6H12O6(s) → 2CH3CH(OH)COOH(s); ΔH° = +2530 kJ/mol
Which of the following statements is true regarding aerobic oxidation and anaerobic glycolysis with respect to energy change as heat?

Prashant Kotian · Accepted Answer

Correct answer: A. The biological energy advantage of a process is determined by how much energy (heat) it releases (highly exothermic is highly favorable).
- Aerobic oxidation releases 2880 kJ/mol of glucose (ΔH° = -2880 kJ/mol).
- Anaerobic glycolysis is printed as endothermic (ΔH° = +2530 kJ/mol).
Therefore, aerobic oxidation releases more energy by:
ΔE = -2880 - (+2530) = -5410 kJ/mol.
This means aerobic oxidation has a biological energy advantage of 5410 kJ/mol over anaerobic glycolysis.

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