Which one of the following is alcoholic amino acid ?

Options

A. Tyrosine and serine
B. Threonine and serine
C. Phenylalanine and tyrosine
D. Tryptophan and phenylalanine

Answer

To determine which one of the following is an alcoholic amino acid, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Amino Acids**:
Amino acids are organic compounds that serve as the building blocks of proteins. They generally have a central carbon atom bonded to four different groups: an amino group (-NH2), a carboxylic acid group (-COOH), a hydrogen atom (H), and a variable side chain (R group).

**Hint**: Remember that the variable group (R) can differ among amino acids and determines their unique properties.

2. **Identify Alcoholic Amino Acids**:
Alcoholic amino acids are those that contain a hydroxyl (-OH) group in their side chain (R group). This characteristic makes them polar and capable of forming hydrogen bonds.

**Hint**: Look for amino acids that have an -OH group in their structure.

3. **List Common Alcoholic Amino Acids**:
The most common alcoholic amino acids include:
- Serine (Ser)
- Threonine (Thr)
- Tyrosine (Tyr)

**Hint**: Familiarize yourself with the names and structures of these amino acids to easily identify them.

4. **Analyze the Options Provided**:
If the options include Serine, Threonine, or any other amino acids, you can identify which ones are alcoholic. Based on the information, Serine and Threonine are both alcoholic amino acids.

**Hint**: Check each option carefully and remember that Phenylalanine is not an alcoholic amino acid.

5. **Select the Correct Answer**:
In this case, if the options include Serine and Threonine, you would select the option that contains either or both of these amino acids as the correct answer.

**Hint**: If the question asks for one alcoholic amino acid, you can choose either Serine or Threonine if they are present in the options.

### Final Answer:
The correct answer is **Threonine** (if it is one of the options provided).