Select the incorrect statement regarding Amphibolic pathway :

Options

A. All carbohydrates are usually converted into glucose before they used for respiration
B. In includes both anabolism and catabolism
C. Acetyl CoA is the connecting link between fat, carbohydrate and protein metabolism
D. PGAL is used for synthesis of pyruvic acid, which later on forms carbohydrate

Answer

### Step-by-Step Solution:

1. **Understanding Amphibolic Pathways**:
- Amphibolic pathways are metabolic pathways that can function in both catabolic (breaking down molecules) and anabolic (building up molecules) processes. This means they are not strictly one or the other but can switch roles depending on the needs of the cell.

**Hint**: Remember that amphibolic pathways can serve dual functions, unlike purely catabolic or anabolic pathways.

2. **Identifying Statements**:
- The question asks to select the incorrect statement regarding amphibolic pathways. We need to analyze each statement provided to determine which one is false.

3. **Evaluating the Statements**:
- **Statement 1**: "All carbohydrates are usually converted into glucose before they are used for respiration."
- This statement is correct because glucose is the primary substrate for cellular respiration.

- **Statement 2**: "All pathways are never purely anabolic or catabolic."
- This statement is also correct as it reflects the nature of amphibolic pathways.

- **Statement 3**: "Acetyl Coenzyme A is the connecting link between fat, carbohydrate, and protein metabolism."
- This statement is correct since Acetyl CoA can be formed from the breakdown of fats, carbohydrates, and proteins, linking these metabolic processes.

- **Statement 4**: "PGL is used for the synthesis of pyruvic acid which later on forms carbohydrate."
- This statement is incorrect. Phosphoglyceraldehyde (PGL) is involved in glycolysis, leading to the formation of pyruvic acid, but it does not directly lead to carbohydrate synthesis.

4. **Conclusion**:
- The incorrect statement regarding amphibolic pathways is the fourth statement about PGL. It misrepresents the role of PGL in carbohydrate metabolism.

### Final Answer:
The incorrect statement regarding the amphibolic pathway is: "PGL is used for the synthesis of pyruvic acid which later on forms carbohydrate."