Question

Steroid hormones, estrogen and testosterone bind to

• A. Membrane ion channels
• B. Enzyme-linked membrane receptors
• C. G-Protein linked membrane receptors
• D. Cytoplasmic receptors

Answer 1

The correct option is D Cytoplasmic receptors

Hormones are of 2 types based on their chemical composition.

1. Protein hormones: They are build up of amino acids and are soluble in water.
   
2. Steroid hormones: They are build up of fats and are not soluble in water.
3. Since the steroid hormones are not soluble in water they can pass through the plasma membrane and bind to the receptors in the cytoplasm.

So the answer is Cytoplasmic receptors.