The substrate for final decarboxylation reaction of aerobic respiration is

Options

A. Oxalosuccinic acid
B. Succinyl Co. A
C. Pyruvic acid
D. `alpha`-Kctoglutaric acid

Answer

To determine the substrate for the final decarboxylation reaction of aerobic respiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Decarboxylation**: Decarboxylation is a biochemical reaction that involves the removal of a carboxyl group (-COOH) from a substrate, releasing carbon dioxide (CO2) in the process.

2. **Identify Key Compounds in Aerobic Respiration**: In the context of aerobic respiration, two important compounds that undergo decarboxylation are:
- Pyruvate (produced from glycolysis)
- Alpha-ketoglutarate (produced in the Krebs cycle)

3. **Decarboxylation of Pyruvate**: Pyruvate undergoes decarboxylation to form Acetyl CoA. This reaction occurs before entering the Krebs cycle.

4. **Decarboxylation of Alpha-Ketoglutarate**: Alpha-ketoglutarate undergoes decarboxylation to produce Succinyl CoA during the Krebs cycle.

5. **Final Decarboxylation Reaction**: The final decarboxylation reactions in aerobic respiration involve both Acetyl CoA and Succinyl CoA. However, since the question specifically asks for the substrate for the final decarboxylation reaction, we focus on the one that occurs later in the Krebs cycle.

6. **Identify the Correct Option**: Among the options provided:
- Option 1: Oxalo succinic acid
- Option 2: Succinyl CoA
- Option 3: Pyruvic acid
- Option 4: Alpha-ketoglutaric acid

The correct answer is **Option 2: Succinyl CoA**, as it is the substrate for the final decarboxylation reaction in the Krebs cycle.

### Final Answer:
The substrate for the final decarboxylation reaction of aerobic respiration is **Succinyl CoA**.

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