Pyruvic acid, the key product of glycolysis can have many metabolic fates. Under aerobic condition it forms

Options

A. Lactic acid
B. `CO_2+H_2O`
C. Acetyl `CoA+CO_2`
D. Ethanol `+CO_2`

Answer

### Step-by-Step Solution:

1. **Understanding Glycolysis**: Glycolysis is the metabolic pathway that breaks down glucose into pyruvic acid. This process occurs in the cytoplasm of the cell and results in the production of ATP, which is used for energy.

2. **Identifying Conditions**: The question specifies aerobic conditions, meaning that oxygen is present. This is important because the fate of pyruvic acid differs depending on whether oxygen is available or not.

3. **Fate of Pyruvic Acid Under Aerobic Conditions**: Under aerobic conditions, pyruvic acid does not remain as pyruvic acid. Instead, it undergoes further processing. Pyruvic acid is converted into acetyl CoA, which is a key substrate for the Krebs cycle (also known as the citric acid cycle).

4. **Formation of Acetyl CoA**: The conversion of pyruvic acid to acetyl CoA occurs in the mitochondria. During this process, one molecule of carbon dioxide is released, and NAD+ is reduced to NADH.

5. **Entry into the Krebs Cycle**: Acetyl CoA then enters the Krebs cycle. In the Krebs cycle, acetyl CoA combines with oxaloacetate to form citrate, which is the first compound in the cycle. This cycle is crucial for the further production of ATP and other high-energy molecules.

6. **Summary of Products**: Therefore, under aerobic conditions, pyruvic acid is converted into acetyl CoA, which then enters the Krebs cycle, ultimately leading to the production of ATP, carbon dioxide, and water.

### Final Answer:
Under aerobic conditions, pyruvic acid forms acetyl CoA, which enters the Krebs cycle.

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