Which of the following acts as a receptor site on the plasma membrane?
Correct answer: D. Glycoproteins
- A. Heads of phospholipid molecules
- B. Cholesterol molecules
- C. Tails of phospholipid molecules
- D. Glycoproteins
Explanation
Glycoproteins are proteins that have carbohydrate chains (oligosaccharides) attached to them. These carbohydrate chains extend outward from the plasma membrane into the extracellular space. Glycoproteins often act as receptors on the cell surface, allowing the cell to recognize and interact with specific molecules, such as hormones, growth factors, or signaling molecules.
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