Question 1
The membrane receptors and second messengers often activate
◦ ATP.
◦ a membrane receptor molecule.
◦ a protein kinase.
◦ cholesterol.
◦ a hormone.
Question 2
The most important factor determining whether a signal molecule will bind to cell-surface or intracellular receptors is the
◦ lipid solubility of the ligand.
◦ location of the receptor molecule.
◦ size of the receptor molecule.
◦ size of the ligand.