In prokaryotic cells, the number of ATPs genrated from one glucose molecule is

Options

A. 36
B. 38
C. 34
D. 32

Answer

To determine the number of ATP molecules generated from one glucose molecule in prokaryotic cells, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Respiration**:
- Respiration in cells involves breaking down glucose to produce energy in the form of ATP. This process can occur in both prokaryotic and eukaryotic cells, but the location and efficiency may differ.

2. **Identify the Location of Respiration in Prokaryotic Cells**:
- In prokaryotic cells (like bacteria), respiration occurs in the cytoplasm since they lack membrane-bound organelles like mitochondria.

3. **Consider the ATP Production Pathways**:
- The main pathways for ATP production from glucose include glycolysis, the Krebs cycle (or citric acid cycle), and the electron transport chain (ETC).

4. **Glycolysis**:
- Glycolysis occurs in the cytoplasm and produces a net gain of 2 ATP molecules and 2 NADH molecules from one glucose molecule.

5. **Krebs Cycle**:
- The Krebs cycle also occurs in the cytoplasm for prokaryotes and generates additional NADH and FADH2, which are used in the electron transport chain.

6. **Electron Transport Chain (ETC)**:
- In prokaryotic cells, the ETC is located in the plasma membrane. Each NADH can yield approximately 3 ATP, and each FADH2 can yield about 2 ATP.

7. **Calculate Total ATP Yield**:
- From glycolysis: 2 ATP
- From the Krebs cycle: 2 ATP (from substrate-level phosphorylation) + 6 NADH (which yield 18 ATP) + 2 FADH2 (which yield 4 ATP).
- Total ATP from Krebs cycle = 2 (from substrate-level) + 18 (from NADH) + 4 (from FADH2) = 24 ATP.
- Total ATP from glycolysis + Krebs cycle = 2 + 24 = 26 ATP.
- Adding the ATP produced from the electron transport chain: 26 ATP (from glycolysis and Krebs) + 12 ATP (from 4 NADH and 2 FADH2) = 38 ATP.

8. **Conclusion**:
- Therefore, the total number of ATP molecules generated from one glucose molecule in prokaryotic cells is **38 ATP**.

### Final Answer:
The number of ATPs generated from one glucose molecule in prokaryotic cells is **38**.

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