Questions: How many O2 molecules are required per glucose molecule during aerobic respiration?

How many O2 molecules are required per glucose molecule during aerobic respiration?
Transcript text: How many $\mathrm{O}_{2}$ molecules are required per glucose molecule during aerobic respiration?
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Solution

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The answer is the second one (6): 6 \(\mathrm{O}_{2}\) molecules are required per glucose molecule during aerobic respiration.

Explanation:

  1. 1 \(\mathrm{O}_{2}\) molecule: This is incorrect. Aerobic respiration requires more than one \(\mathrm{O}_{2}\) molecule to fully oxidize one glucose molecule.

  2. 6 \(\mathrm{O}_{2}\) molecules: This is correct. The balanced chemical equation for aerobic respiration of glucose is: \[ \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{energy (ATP)} \] This equation shows that 6 molecules of \(\mathrm{O}_{2}\) are required to completely oxidize one molecule of glucose.

  3. 2 \(\mathrm{O}_{2}\) molecules: This is incorrect. As shown in the balanced equation, 2 \(\mathrm{O}_{2}\) molecules are insufficient for the complete oxidation of one glucose molecule.

  4. 12 \(\mathrm{O}_{2}\) molecules: This is incorrect. The balanced equation only requires 6 \(\mathrm{O}_{2}\) molecules, not 12.

  5. 3 \(\mathrm{O}_{2}\) molecules: This is incorrect. Similar to the previous options, 3 \(\mathrm{O}_{2}\) molecules are not enough for the complete oxidation of one glucose molecule.

In summary, 6 \(\mathrm{O}_{2}\) molecules are required per glucose molecule during aerobic respiration.

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