During aerobic breakdown (respiration) of a molecule of glucose, the number of CO2 molecules released inside mitochondria but outside TCA cycle will be :-

Options

A. 2
B. 4
C. 6
D. 8

Answer

To determine the number of CO2 molecules released during the aerobic breakdown of a molecule of glucose inside the mitochondria but outside the TCA cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Aerobic Respiration**: Aerobic respiration consists of several stages: glycolysis, the conversion of pyruvate to acetyl-CoA, the TCA cycle (Krebs cycle), and the electron transport chain.

2. **Glycolysis**: Glycolysis occurs in the cytoplasm and breaks down one molecule of glucose into two molecules of pyruvate. This process does not release any CO2.

3. **Conversion of Pyruvate to Acetyl-CoA**: After glycolysis, each pyruvate molecule enters the mitochondria. Here, each pyruvate undergoes oxidative decarboxylation to form acetyl-CoA. During this process, one carbon atom is removed from each pyruvate, releasing it as CO2.

4. **Calculating CO2 Release**: Since one molecule of glucose produces two molecules of pyruvate, the conversion of these two pyruvate molecules will release a total of 2 CO2 molecules (1 CO2 per pyruvate).

5. **Conclusion**: Therefore, during the aerobic breakdown of one molecule of glucose, the number of CO2 molecules released inside the mitochondria but outside the TCA cycle is 2.

### Final Answer:
The number of CO2 molecules released inside mitochondria but outside the TCA cycle during the aerobic breakdown of one molecule of glucose is **2**.

---