Tyrosine is coded by a letter

Options

A. S
B. C
C. Y
D. E

Answer

To determine which letter codes for the amino acid tyrosine, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the one-letter code that represents the amino acid tyrosine.

2. **Identify Tyrosine**: Tyrosine is a non-essential amino acid that can be synthesized from another amino acid called phenylalanine.

3. **Know the Types of Codes**: There are two types of codes for amino acids: one-letter codes and three-letter codes.

4. **List the Options**: The options provided are S, C, Y, and E.

5. **Analyze Each Option**:
- **S**: This is the one-letter code for serine. The three-letter code for serine is Ser.
- **C**: This is the one-letter code for cysteine. The three-letter code for cysteine is Cys.
- **Y**: This is the one-letter code for tyrosine. The three-letter code for tyrosine is Tyr.
- **E**: This is the one-letter code for glutamic acid. The three-letter code for glutamic acid is Glu.

6. **Select the Correct Answer**: Since we are looking for the one-letter code for tyrosine, the correct answer is **Y**.

### Final Answer:
The one-letter code for tyrosine is **Y**.

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