The amino acid that acts as a carrier of ammonia from skeletal muscle to liver
(a) Alanine
(b) Arginine
(c) Methionine
(d) Glutamate

Options

A. Alanine
B. Arginine
C. Methionine
D. Glutamate.

Answer

To solve the question regarding which amino acid acts as a carrier of ammonia from skeletal muscle to the liver, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Ammonia in the Body**:
- Ammonia (NH3) is a toxic byproduct of protein metabolism. It needs to be transported safely from the skeletal muscles, where it is produced, to the liver for detoxification.

2. **Identify the Amino Acids Listed**:
- The options provided are:
- (a) Alanine
- (b) Arginine
- (c) Methionine
- (d) Glutamate

3. **Determine the Function of Each Amino Acid**:
- **Alanine**: It can carry ammonia, but primarily it is involved in the glucose-alanine cycle.
- **Arginine**: It plays a role in the urea cycle but is not primarily responsible for transporting ammonia from muscles to the liver.
- **Methionine**: This amino acid is involved in methylation processes and does not primarily function as an ammonia carrier.
- **Glutamate**: This amino acid is known for its role in nitrogen metabolism and can convert ammonia into a less toxic form.

4. **Identify the Correct Amino Acid**:
- Glutamate can accept ammonia to form glutamine, which is a non-toxic amino acid. It is then transported to the liver, where it can be converted into urea, thus facilitating the safe transport of ammonia.

5. **Conclusion**:
- Based on the above analysis, the amino acid that acts as a carrier of ammonia from skeletal muscle to the liver is **(d) Glutamate**.

### Final Answer:
**(d) Glutamate**