Question

Chemically, oestrogens (oestradiol) are:

• A. Amine hormones
• B. Peptide hormones
• C. Steroid hormones
• D. Protein hormones

Hint:

Steroid hormones are lipid-soluble and can easily pass through cell membranes to bind to intracellular receptors, influencing gene expression directly.

Answer 1

The Correct Option is C

Step 1: Understanding Oestrogens
Oestrogens, including oestradiol, are a group of hormones that play a crucial role in the regulation of the female reproductive system. Step 2: Classification of Hormones
Hormones can be classified into different categories based on their chemical composition:
- Amine hormones are derived from amino acids (e.g., adrenaline, thyroxine).
- Peptide hormones are made up of chains of amino acids (e.g., insulin).
- Protein hormones are larger chains of amino acids (e.g., growth hormone).
- Steroid hormones are derived from cholesterol (e.g., oestrogen, testosterone, cortisol).
Step 3: Identifying the Nature of Oestrogen
Oestrogens, including oestradiol, are derived from cholesterol and have a steroid structure. They belong to the class of steroid hormones. Step 4: Conclusion
Since oestrogens are steroid hormones, the correct answer is Option (3) Steroid hormones.