Carbon skeleton produced during respiration. (Eg. `alpha`-ketoglutarate, OAA etc. intermediates) are used as precursor for biosynthesis of other molecules in the cell.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Role of Carbon Skeletons**: Carbon skeletons are the backbone structures of organic molecules. During respiration, various intermediates are produced that serve as these carbon skeletons.

2. **Key Intermediates in Respiration**: Some important carbon skeletons produced during respiration include:
- **α-ketoglutarate**: This is a key intermediate in the Krebs cycle (Citric Acid Cycle) and plays a crucial role in amino acid synthesis.
- **Oxaloacetic Acid (OAA)**: Another important intermediate in the Krebs cycle, OAA is involved in the synthesis of glucose through gluconeogenesis.
- **Acetic Acid**: This can be converted into acetyl-CoA, which is also a vital precursor for various biosynthetic pathways.

3. **Biosynthesis of Other Molecules**: The carbon skeletons produced during respiration are used as precursors for the biosynthesis of:
- **Glucose**: Through gluconeogenesis, which is essential for energy storage and metabolism.
- **Amino Acids**: The intermediates from the Krebs cycle can be used to synthesize various amino acids, which are the building blocks of proteins.

4. **Respiration Overview**: Respiration is a metabolic process that can be divided into two phases:
- **Catabolic Phase**: This phase involves breaking down complex molecules into simpler ones, releasing energy in the form of ATP.
- **Anabolic Phase**: In this phase, simpler molecules are rebuilt into complex molecules, such as glycogen, which serves as a form of energy storage.

5. **Conclusion**: The statement that carbon skeletons produced during respiration are used as precursors for biosynthesis of other molecules in the cell is indeed true. These intermediates play a vital role in the metabolic pathways that synthesize essential biomolecules.

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