AP Biology Quiz
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CELL COMMUNICATION AND CELL CYCLE
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In a cell, a ligand activates a receptor that opens a Ca2+^{2+} channel in the plasma membrane. Incoming Ca2+^{2+} activates a Ca2+^{2+}-dependent kinase that phosphorylates the same Ca2+^{2+} channel, increasing its open probability. A kinase inhibitor reduces the steep rise in Ca2+^{2+} during ligand exposure but does not affect ligand binding. Which outcome best illustrates how feedback changes pathway behavior?
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