`alpha`-ketogultaric acid is raw material for the synthesis of :

Options

A. Carotenoids
B. Pyrimidines
C. Amino acids
D. Alkaloids

Answer

### Step-by-Step Solution:

1. **Understanding Alpha-Ketoglutaric Acid**:
- Alpha-ketoglutaric acid is an important intermediate in the TCA cycle (Krebs cycle), which is a crucial part of aerobic respiration in plants and other organisms.

2. **Role in Amino Acid Synthesis**:
- In the TCA cycle, alpha-ketoglutaric acid can combine with other compounds. One significant reaction involves its conversion to glutamate, an amino acid.

3. **Enzyme Involvement**:
- The conversion of alpha-ketoglutaric acid to glutamate is facilitated by the enzyme alanine transaminase. This process also involves the amino acid alanine.

4. **Formation of Other Amino Acids**:
- Glutamate, formed from alpha-ketoglutaric acid, serves as a precursor for the synthesis of other amino acids such as glutamine, proline, arginine, and lysine.

5. **Evaluating the Options**:
- The options provided are:
- A) Carotenoids
- B) Pyrimidines
- C) Amino acids
- D) Alkaloids
- Since alpha-ketoglutaric acid is directly involved in the synthesis of amino acids, particularly glutamate, the correct answer is option C) Amino acids.

### Final Answer:
Alpha-ketoglutaric acid is a raw material for the synthesis of **amino acids**.

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