Extracellular messengers binding on surface receptors may exert effects on cells via all the following means, except:
A) opening gated channels.
B) opening a gated channel through activation of a G protein.
C) activation of the adenylyl cyclase system.
D) binding to sites and then being endocytized.
E) ultimately activating protein kinases.

Question

Quizplus · Accepted Answer

Binding to sites and then being endocytized does not result in direct effects on the cell surface. The other four choices all result in direct effects on the cell surface and/or intracellular signaling pathways.

Extracellular Messengers Binding on Surface Receptors May Exert Effects on Cells