A Krebs cycle intermediate as raw material for chlorophyll production is synthesised after

Options

A. Condensation
B. Substrate level phosphorylation
C. Hydration
D. Oxidative decarboxylation

Answer

To answer the question regarding the synthesis of a Krebs cycle intermediate as a raw material for chlorophyll production, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Chlorophyll Production**:
- Chlorophyll is a vital pigment in plants that plays a critical role in photosynthesis. Its production requires specific precursors, one of which is derived from the Krebs cycle.

2. **Identifying the Key Intermediate**:
- The key intermediate from the Krebs cycle that is important for chlorophyll production is **succinyl coenzyme A**. This compound contains a porphyrin ring, which is essential for the formation of chlorophyll.

3. **Formation of Succinyl Coenzyme A**:
- Succinyl coenzyme A is synthesized from **alpha-ketoglutarate**, which is a 5-carbon compound. This transformation occurs during the Krebs cycle.

4. **Decarboxylation Process**:
- The conversion of alpha-ketoglutarate to succinyl coenzyme A involves a process known as **decarboxylation**. During this reaction, one carbon dioxide (CO2) molecule is released, resulting in the formation of the 4-carbon succinyl coenzyme A.

5. **Oxidative Decarboxylation**:
- The decarboxylation of alpha-ketoglutarate to succinyl coenzyme A is also an **oxidative reaction**. In this process, NAD+ is reduced to NADH, which indicates that oxidation is occurring alongside decarboxylation.

6. **Conclusion**:
- Therefore, the Krebs cycle intermediate (succinyl coenzyme A) that serves as a raw material for chlorophyll production is synthesized after the process of **oxidative decarboxylation**.

### Final Answer:
The Krebs cycle intermediate as raw material for chlorophyll production is synthesized after **oxidative decarboxylation**.

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