Question

Receptors for protein hormones are found

• A. Inside nucleus
• B. Inside cytoplasm
• C. On surface of ER
• D. On the plasma membrane of the cell

Answer 1

Answer: (D)

On the plasma membrane of the cell

Protein hormones are peptide hormones which are derived from amino acids. These are insoluble in lipids and hence can't enter the target cell (cell membrane is a lipid bilayer). These act as primary messengers at the surface of target cell by binding to cell surface receptors and this results in the formation of a hormone-receptor complex.

So, the correct answer is 'On the plasma membrane of the cell'.