During complet metabolism of glucose, the number of ATP formed is

Options

A. 2
B. 12
C. 36
D. 44

Explanation

To determine the number of ATP molecules formed during the complete metabolism of glucose, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Glucose Metabolism**:
- The complete metabolism of glucose occurs through a series of biochemical processes, primarily glycolysis, the Krebs cycle, and oxidative phosphorylation.

2. **Glycolysis**:
- In glycolysis, 2 ATP molecules are produced directly from the breakdown of glucose into pyruvate.

3. **Krebs Cycle (Citric Acid Cycle)**:
- Each glucose molecule leads to the formation of 2 acetyl-CoA molecules, which enter the Krebs cycle.
- During the Krebs cycle, for each glucose molecule, 10 NADH and 2 FADH2 molecules are produced.

4. **ATP Yield from NADH and FADH2**:
- Each NADH can generate approximately 3 ATP through oxidative phosphorylation.
- Each FADH2 can generate approximately 2 ATP.
- Therefore, from 10 NADH:
- 10 NADH × 3 ATP/NADH = 30 ATP
- And from 2 FADH2:
- 2 FADH2 × 2 ATP/FADH2 = 4 ATP

5. **Total ATP from Krebs Cycle**:
- Adding the ATP from NADH and FADH2 gives:
- 30 ATP (from NADH) + 4 ATP (from FADH2) = 34 ATP

6. **Direct ATP from Glycolysis**:
- Adding the 2 ATP produced directly in glycolysis gives:
- 34 ATP (from Krebs cycle) + 2 ATP (from glycolysis) = 36 ATP

7. **Accounting for ATP Usage**:
- During the process of transporting NADH into the mitochondria, 2 ATP are used.
- Therefore, we subtract these 2 ATP from the total:
- 36 ATP - 2 ATP = 34 ATP

8. **Final Count**:
- The total number of ATP produced during the complete metabolism of glucose is 36 ATP.

### Final Answer:
The number of ATP formed during the complete metabolism of glucose is **36 ATP**.