Ornithine an amino acid is found

Options

A. As an intermediate of urea synthesis
B. As an intermediate of methonine metabolism
C. As a major fraction of the connective tissue
D. In bile salts

Explanation

**Step-by-Step Solution:**

1. **Identify Ornithine**: Recognize that Ornithine is classified as an amino acid. It is important to note that it is a non-proteinogenic amino acid, meaning it is not incorporated into proteins but plays significant roles in metabolic processes.

2. **Role in Urea Cycle**: Understand that Ornithine is a key intermediate in the urea cycle, which is the metabolic pathway responsible for the conversion of ammonia to urea in the liver. This process is crucial for detoxifying ammonia, a byproduct of protein metabolism.

3. **Conversion to Arginine**: Acknowledge that Ornithine can be converted to L-Arginine, another amino acid, through various biochemical reactions in the urea cycle. This conversion is part of the process that leads to the production of urea.

4. **Presence in Metabolism**: Recognize that Ornithine is also involved in the metabolism of other compounds, including its role in the synthesis of bile salts and its presence in connective tissues.

5. **Conclusion**: Based on the information gathered, conclude that Ornithine is found primarily as an intermediate in the urea synthesis process, as well as in other metabolic pathways.

**Final Answer**: Ornithine, an amino acid, is found as an intermediate of urea synthesis and plays a significant role in various metabolic processes.

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