All cells of a multicellular organism may not respond in the same way to a particular ligand (signaling molecule) that binds to a cell surface receptor. The difference in response may be due to
a) the type of receptor for the ligand that the cell expresses.
b) the affinity of the ligand for the receptor in a given cell type.
c) the type of signal transduction pathways that the cell expresses.
d) the type of target proteins that the cell expresses.
e) all of the above.
Answer: E