Pathways in which complex compounds are converted to simple compounds by the release of energy are

Options

A. Anabolic pathways
B. Catabolic pathways
C. Amphibolic pathways
D. All the above

Answer

To answer the question, "Pathways in which complex compounds are converted to simple compounds by the release of energy are," we need to understand the types of metabolic pathways involved in cellular metabolism.

### Step-by-Step Solution:

1. **Understanding Metabolic Pathways**: Metabolic pathways are series of chemical reactions occurring within a cell. They can be classified into two main types: anabolic pathways and catabolic pathways.

2. **Defining Anabolic Pathways**: Anabolic pathways involve the synthesis of complex molecules from simpler ones. This process requires energy, usually in the form of ATP. Therefore, anabolic pathways are endothermic and do not release energy.

3. **Defining Catabolic Pathways**: Catabolic pathways, on the other hand, involve the breakdown of complex molecules into simpler ones. This breakdown process releases energy, which can be harnessed by the cell for various functions. Thus, catabolic pathways are exothermic.

4. **Identifying Amphibolic Pathways**: Amphibolic pathways are those that can function in both anabolic and catabolic directions. They can either synthesize complex molecules or break them down, depending on the needs of the cell.

5. **Answering the Question**: The question specifically asks for pathways that convert complex compounds to simple compounds while releasing energy. This description matches catabolic pathways, as they are responsible for the breakdown of complex molecules and the release of energy.

6. **Conclusion**: Therefore, the correct answer to the question is **catabolic pathway**.

### Final Answer:
The pathways in which complex compounds are converted to simple compounds by the release of energy are called **catabolic pathways**.

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