10. Cell Signaling
Classes of Signaling Receptors
Multiple Choice
Multiple ChoiceG-protein-coupled receptors __________, whereas receptor tyrosine kinases __________.
A
act by phosphorylating a protein; open an ion channel when bound to a signal molecule
B
are transmembrane proteins; are found only on the cytoplasmic side of the plasma membrane
C
form a dimer when activated; catalyze the transfer of a phosphate group from ATP to an amino acid
D
phosphorylate the amino acid guanine; phosphorylate the amino acid threonine
E
are not enzymes; have enzymatic function
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