試題詳解

7. Which of the following statements concerning receptor enzymes is correct?
(A) They are not usually membrane-associated proteins.
(B) They contain an enzyme activity that acts upon a cytosolic substrate.
(C) They contain an enzyme activity that acts upon the extracellular ligand.
(D) They have a ligand-binding site on the cytosolic side of the membrane.
(E) They have an active site on the extracellular side of the membrane