Among the following total number of essential amino acids: Leucine, Alanine, Phenylalanine, Proline, Threonine, Lysine, Histidine, Arginine, Cysteine, Tryptophan, Serine, Valine is

Answer

To determine the total number of essential amino acids from the provided list, we need to identify which of the listed amino acids are classified as essential. Essential amino acids are those that the body cannot synthesize on its own and must be obtained through diet.

### Step-by-Step Solution:

1. **List the Given Amino Acids**:
- Leucine
- Alanine
- Phenylalanine
- Proline
- Threonine
- Lysine
- Histidine
- Arginine
- Cysteine
- Tryptophan
- Serine
- Valine

2. **Identify Essential Amino Acids**:
The essential amino acids are:
- Isoleucine
- Leucine
- Lysine
- Methionine
- Phenylalanine
- Threonine
- Tryptophan
- Histidine

Note: Arginine is considered essential in certain conditions (like growth or illness), but it is not classified as essential for adults under normal circumstances.

3. **Check Each Amino Acid from the List**:
- **Leucine**: Essential
- **Alanine**: Not essential
- **Phenylalanine**: Essential
- **Proline**: Not essential
- **Threonine**: Essential
- **Lysine**: Essential
- **Histidine**: Essential
- **Arginine**: Not essential (for adults)
- **Cysteine**: Not essential
- **Tryptophan**: Essential
- **Serine**: Not essential
- **Valine**: Essential

4. **Count the Essential Amino Acids**:
From the list, the essential amino acids identified are:
- Leucine
- Phenylalanine
- Threonine
- Lysine
- Histidine
- Tryptophan
- Valine

Total number of essential amino acids = 7

### Final Answer:
The total number of essential amino acids among the given options is **7**.

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