Common molecule formed from all food stuffs during aerobic respiration is

Options

A. Glucose
B. PGAL
C. Pyruvic acid
D. Acetyl CoA

Answer

### Step-by-Step Solution:

1. **Identify the Food Components**: The primary food components that provide energy during aerobic respiration are carbohydrates, proteins, and fats.

2. **Carbohydrate Metabolism**:
- The main carbohydrate in food is glucose.
- Glucose undergoes glycolysis, where it is converted into pyruvic acid.

3. **Conversion of Pyruvic Acid**:
- The pyruvic acid produced from glycolysis is then converted into acetyl coenzyme A (acetyl-CoA).

4. **Protein Metabolism**:
- Proteins are digested into amino acids.
- Certain amino acids can be converted into acetyl-CoA through various metabolic pathways.

5. **Fat Metabolism**:
- Fats are broken down into fatty acids and glycerol.
- Fatty acids undergo beta-oxidation to form acetyl-CoA.
- Glycerol can also be converted into pyruvic acid and subsequently into acetyl-CoA.

6. **Conclusion**:
- All three types of food components (carbohydrates, proteins, and fats) ultimately convert into acetyl-CoA during aerobic respiration.
- Therefore, the common molecule formed from all foodstuffs during aerobic respiration is **acetyl-CoA**.

### Final Answer:
The common molecule formed from all foodstuffs during aerobic respiration is **acetyl-CoA**.

---