Which statement concerning receptor enzymes is CORRECT?
A) They are not usually membrane-associated proteins.
B) They contain an enzyme activity that acts on a cytosolic substrate.
C) They contain an enzyme activity that acts on 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.

Question

Quizplus · Accepted Answer

Receptor enzymes are typically membrane-associated proteins that have an enzyme activity acting on a cytosolic substrate. Upon ligand binding to the extracellular part of the receptor, a signal is transduced inside the cell, activating the enzyme's catalytic activity on the cytosolic side.

Which Statement Concerning Receptor Enzymes Is CORRECT