Which is cited as an example of a protein receptor in the material?

Which is cited as an example of a protein receptor in the material?

• A. hair
• B. collagen
• C. enolase
• D. myosin

Answer: (A)

Protein receptors are proteins that bind specific signaling molecules (ligands) and trigger a response inside the cell. The material uses hair as an example of a protein receptor to illustrate that receptor functionality comes from a protein’s ability to bind a molecule, not from a particular type of function like enzyme activity or motor movement. Hair is composed of protein (keratin), and the discussion treats this protein as capable of participating in signaling through binding interactions, which is why it’s cited as a receptor example. The other proteins listed have clear primary roles that aren’t receptor functions in that context: enolase is an enzyme in glycolysis, myosin is a motor protein involved in contraction, and collagen is a structural protein in connective tissue. They are not described as receptors in the material, so they don’t serve as the cited example of a protein receptor there.

Protein receptors are proteins that bind specific signaling molecules (ligands) and trigger a response inside the cell. The material uses hair as an example of a protein receptor to illustrate that receptor functionality comes from a protein’s ability to bind a molecule, not from a particular type of function like enzyme activity or motor movement. Hair is composed of protein (keratin), and the discussion treats this protein as capable of participating in signaling through binding interactions, which is why it’s cited as a receptor example.

The other proteins listed have clear primary roles that aren’t receptor functions in that context: enolase is an enzyme in glycolysis, myosin is a motor protein involved in contraction, and collagen is a structural protein in connective tissue. They are not described as receptors in the material, so they don’t serve as the cited example of a protein receptor there.