In Krebs' cycle, number of molecules of `CO_(2)`, NADH. `FADH_(2)` and ATP produced from one glucose molecule

Options

A. `6 CO_(2).,8NADH. 1 FADH_(2), 1 ATP `
B. `6 CO_(2), 6 NADH. 2 FADH_(2), 2 ATP`
C. `4 CO_(2), 6 NADH. 1 FADH_(2), 1 ATP `
D. `4 CO_(2), 6 NADH. 2 FADH_(2), 2 ATP `

Explanation

To determine the number of molecules of CO2, NADH, FADH2, and ATP produced from one glucose molecule during the Krebs cycle, we can break down the process step by step:

### Step 1: Understanding the Krebs Cycle
The Krebs cycle, also known as the citric acid cycle or TCA cycle, is a crucial part of cellular respiration that occurs in the mitochondria. It processes acetyl-CoA derived from glucose to produce energy carriers.

### Step 2: Starting Material
One glucose molecule (C6H12O6) is broken down into two molecules of pyruvate during glycolysis. Each pyruvate then enters the Krebs cycle.

### Step 3: Conversion of Pyruvate to Acetyl-CoA
Before entering the Krebs cycle, each pyruvate is converted into acetyl-CoA, releasing one molecule of CO2. Since one glucose produces two pyruvate molecules, this step results in the release of 2 CO2.

### Step 4: Counting CO2 Production in the Krebs Cycle
In the Krebs cycle, each acetyl-CoA that enters the cycle produces 2 additional molecules of CO2. Since one glucose molecule generates two acetyl-CoA, the total CO2 produced in the Krebs cycle from one glucose molecule is:
- 2 CO2 (from pyruvate to acetyl-CoA) + 4 CO2 (from the Krebs cycle) = **6 CO2**.

### Step 5: Counting NADH Production
During the Krebs cycle, each turn produces 3 NADH. Since one glucose molecule results in two turns of the cycle (one for each acetyl-CoA), the total NADH produced is:
- 3 NADH per cycle × 2 cycles = **6 NADH**.

### Step 6: Counting FADH2 Production
Each turn of the Krebs cycle also produces 1 FADH2. Therefore, for two turns of the cycle:
- 1 FADH2 per cycle × 2 cycles = **2 FADH2**.

### Step 7: Counting ATP Production
The Krebs cycle directly produces 1 ATP (or GTP) per cycle. Thus, for two cycles:
- 1 ATP per cycle × 2 cycles = **2 ATP**.

### Final Summary
From one glucose molecule, the total production in the Krebs cycle is:
- **CO2**: 6 molecules
- **NADH**: 6 molecules
- **FADH2**: 2 molecules
- **ATP**: 2 molecules

### Conclusion
The correct answer is:
- 6 CO2, 6 NADH, 2 FADH2, and 2 ATP.