Which of the following is a derivative of amino acids ?

Options

A. Thyroxin
B. estradiol
C. estrone
D. Progesterone

Answer

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks which of the given options is a derivative of amino acids.

2. **Review the Options:** The options provided include various hormones. We need to analyze each one to determine if it is derived from an amino acid.

3. **Analyze Thyroxine:**
- Thyroxine is a hormone produced by the thyroid gland.
- It is known to play a crucial role in metabolism, heart function, and muscle control.
- Thyroxine is synthesized from the amino acid tyrosine. The structure of tyrosine is represented as OH-CH2-COOH-NH2.
- In the formation of thyroxine, one of the hydroxyl groups in tyrosine is replaced by iodine atoms.

4. **Analyze Estradiol:**
- Estradiol is a hormone produced by the ovaries.
- It is primarily involved in the maturation and maintenance of the female reproductive system.
- Estradiol is a steroid hormone and is not derived from amino acids.

5. **Analyze Estrone:**
- Estrone is another hormone related to the female reproductive system and is considered a weaker form of estrogen.
- Like estradiol, estrone is also a steroid hormone and does not derive from amino acids.

6. **Analyze Progesterone:**
- Progesterone is a hormone that prepares the uterine lining for a fertilized egg.
- It is also a steroid hormone and is not derived from amino acids.

7. **Conclusion:** After analyzing all the options, it is clear that thyroxine is the only hormone listed that is a derivative of an amino acid (specifically, tyrosine).

**Final Answer:** Thyroxine is a derivative of amino acids.

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