Which one is not a steroid hormone?

Options

A. Aldosterone
B. Androgen
C. Testosterone
D. Vasopressin.

Answer

To determine which hormone is not a steroid hormone, we can follow these steps:

1. **Understand the Types of Hormones**: Hormones can be classified into two main categories: steroid hormones and peptide hormones. Steroid hormones are derived from cholesterol and are lipid-soluble, while peptide hormones are made up of amino acids and are water-soluble.

2. **Identify the Given Hormones**: The hormones listed in the question are:
- Aldosterone
- Androgen
- Testosterone
- Vasopressin

3. **Classify Each Hormone**:
- **Aldosterone**: This is a steroid hormone produced by the adrenal glands and is involved in regulating sodium and potassium levels.
- **Androgen**: This is a class of steroid hormones, which includes testosterone and is responsible for male traits and reproductive activity.
- **Testosterone**: This is also a steroid hormone, primarily involved in the development of male reproductive tissues and secondary sexual characteristics.
- **Vasopressin**: Also known as antidiuretic hormone (ADH), this is a peptide hormone composed of nine amino acids and is secreted by the posterior pituitary gland.

4. **Determine the Answer**: Based on the classification:
- Aldosterone, androgen, and testosterone are all steroid hormones.
- Vasopressin is a peptide hormone.

Thus, the hormone that is not a steroid hormone is **vasopressin**.