Which one is component of ornithine cycle

Options

A. Arginine and ornithine
B. Glycine and methionine
C. Aspartic and glutamic acids
D. Valine and cystine

Answer

To determine which components are part of the Ornithine cycle, also known as the urea cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Ornithine Cycle**:
- The Ornithine cycle is a biochemical process that converts ammonia, a toxic byproduct of protein metabolism, into urea, which is less toxic and can be excreted by the body. This cycle primarily occurs in the liver.

2. **Identifying Key Components**:
- The cycle involves several key molecules, including ornithine, citrulline, argininosuccinate, arginine, and urea.

3. **Analyzing the Options**:
- **Option 1**: Arginine and Ornithine - Both of these are directly involved in the cycle.
- **Option 2**: Glycine and Methionine - These amino acids are not part of the Ornithine cycle.
- **Option 3**: Aspartic and Glutamic acid - These are amino acids but not components of the Ornithine cycle.
- **Option 4**: Valine and Cysteine - These amino acids are also not part of the Ornithine cycle.

4. **Conclusion**:
- Since both arginine and ornithine are integral to the cycle, the correct answer is **Option 1: Arginine and Ornithine**.

### Final Answer:
The component of the Ornithine cycle is **Arginine and Ornithine** (Option 1).

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