How many rounds of Kreb's cycle are required to produce `6 FADH_2` molecules ?

Options

A. 3
B. 6
C. 12
D. 1

Answer

To determine how many rounds of the Krebs cycle are required to produce 6 FADH2 molecules, we can follow these steps:

### Step-by-step Solution:

1. **Understand the Krebs Cycle**: The Krebs cycle, also known as the TCA (Tricarboxylic Acid) cycle, is a series of biochemical reactions used by all aerobic organisms to generate energy.

2. **Identify the Products of One Cycle**: In one complete round of the Krebs cycle, the following products are generated:
- 3 NADH
- 1 FADH2
- 1 ATP (or GTP)
- 2 CO2

3. **Determine FADH2 Production**: From the information above, we see that each round of the Krebs cycle produces 1 molecule of FADH2.

4. **Calculate Rounds for 6 FADH2**: To find out how many rounds of the Krebs cycle are needed to produce 6 FADH2 molecules, we can set up the equation:
\[ \text{Number of rounds} = \frac{\text{Desired FADH2}}{\text{FADH2 per cycle}} = \frac{6}{1} = 6 \]

5. **Conclusion**: Therefore, to produce 6 FADH2 molecules, 6 rounds of the Krebs cycle are required.

### Final Answer:
**6 rounds of the Krebs cycle are required to produce 6 FADH2 molecules.**

---