Receptors Resemble Enzymes in That

Receptors resemble enzymes in that

A) receptors and enzymes (most often) are polysaccharides.
B) receptors and enzymes may be either integral membrane proteins or soluble proteins.
C) receptor ligands, like enzyme substrates, are altered during signal transduction.
D) receptors and enzymes are not specific for the molecules they bind.
E) receptors generally have enzymatic activity.