12. Biosignaling
Introduction to Biosignaling
Multiple Choice
Multiple ChoiceWhich of the following statements regarding signal transduction pathways in cells is FALSE?
A
A ligand, such as a hormone, binds to a specific cell surface receptor on a target cell.
B
Signal transduction cascades, often involving protein kinases, amplify a signal intracellularly.
C
A receptor changes conformation upon ligand binding, transmitting a signal across the cell membrane.
D
Signal transduction cascades directly transmit a single stimulus to one, single target, identically in all cells.
E
Phosphatases remove phosphoryl groups from polypeptides, regulating a cell's response.
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