Carbon skeleton produced during respiration is used as precursor for biosynthesis of other molecules in the cell thus respiration is:

Options

A. Catabolic process
B. Anabolic process
C. Amphibolic process
D. Developmental process

Answer

To solve the question regarding the role of respiration in the production of carbon skeletons used for biosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Respiration**:
- Respiration is a metabolic process that converts glucose and other substrates into energy (ATP) while producing byproducts such as carbon skeletons.

2. **Identifying Carbon Skeletons**:
- During the process of cellular respiration, particularly in the TCA (Krebs) cycle, carbon skeletons such as alpha-ketoglutarate and oxaloacetate are produced. These molecules are crucial for various biosynthetic pathways.

3. **Role of TCA Cycle**:
- The TCA cycle is a key metabolic pathway that not only generates energy but also provides intermediates (carbon skeletons) for the synthesis of amino acids, nucleotides, and other biomolecules.

4. **Anabolic vs. Catabolic Processes**:
- Anabolic processes are those that build larger molecules from smaller ones, often requiring energy. In contrast, catabolic processes break down molecules to release energy.
- The production of carbon skeletons during respiration is primarily an anabolic process because these skeletons are used to synthesize larger biomolecules.

5. **Specific Enzymatic Reaction**:
- The conversion of isocitrate to alpha-ketoglutarate is catalyzed by the enzyme isocitrate dehydrogenase. This step is crucial as it represents the generation of a carbon skeleton in the TCA cycle.

6. **Conclusion**:
- Therefore, since respiration produces carbon skeletons that serve as precursors for biosynthesis, it can be classified as an anabolic process.

### Final Answer:
Thus, respiration is an **anabolic process** because it produces carbon skeletons that are used as precursors for the biosynthesis of other molecules in the cell.

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