In What Way Do Ligand-Receptor Interactions Differ from Enzyme-Substrate Reactions

Multiple Choice

In what way do ligand-receptor interactions differ from enzyme-substrate reactions?

A) The ligand signal is not usually metabolized into useful products.
B) Receptor-ligand interactions do not obey the laws of mass action.
C) Inhibitors never bind to the ligand-binding site.
D) Reversibility never occurs in the ligand-receptor interaction.
E) The enzyme-substrate reaction and the ligand-receptor interaction do not differ.