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How many ATPs are produced for the complete oxidation of a glucose molecule to H₂O and CO₂?

1) 96.5
2) 98.5
3) 48.5
4) 90.5
5) 98

Answer :

The correct answer is 5) 2 ATPs from glycolysis + 1 GTP from the citric acid cycle.

Here's the breakdown of ATP production in the complete oxidation of glucose:

1. **Glycolysis**: In glycolysis, one molecule of glucose is converted into two molecules of pyruvate, generating a net of 2 ATP molecules (since 2 ATP are consumed in the initial steps, but 4 ATP are produced in the later steps, resulting in a net gain of 2 ATP).

2. **Citric Acid Cycle (TCA cycle)**: Each pyruvate molecule is converted into acetyl-CoA and enters the citric acid cycle. During the citric acid cycle, the acetyl-CoA is completely oxidized, leading to the production of 1 GTP (which can be converted to ATP) per turn of the cycle. Since glucose generates 2 pyruvate molecules, the total yield from one glucose molecule is 2 ATP from glycolysis and 1 GTP from the citric acid cycle.

Therefore, the total ATP production for the complete oxidation of glucose to H₂O and CO₂ is 2 ATPs from glycolysis + 1 GTP from the citric acid cycle, totaling 3 ATPs.

The probable question may be:

How many ATPs are produced for the complete oxidation of glucose to H₂O and CO₂?

1) 3

2) 2

3) 30

4) 4

5) 2 ATPs from glycolysis + 1 GTP from the citric acid cycle

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