According to Fig. 9.6, what is a key difference between cell signaling mediated by a surface receptor, compared to that mediated by an intracellular receptor?
A. Cell-surface receptors bind to specific
signaling molecules; intracellular receptors
bind any signaling molecule.
B. Cell-surface receptors typically bind to
smaller signaling molecules than those bound
by intracellular receptors.
C. Cell-surface receptors bind polar signaling
molecules; intracellular receptors bind
nonpolar signaling molecules.
D. Signaling molecules that bind to cellsurface
receptors lead to cellular responses
restricted to the cytoplasm; signaling
molecules that bind to intracellular receptors
lead to cellular responses restricted to the
nucleus.
E. None of these statements about cell
signaling differences is correct.
C
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