AP Biologymediummcq1 pt
In a signaling pathway, a second messenger's main advantage is
A.rapid diffusion and amplification inside the cell
B.crossing the plasma membrane
C.binding DNA directly
D.replacing the receptor
Explanation
Core Concept
Small molecules like cAMP or Ca²⁺ spread quickly through the cytoplasm and each copy can activate many targets — multiplying a single receptor event enormously.
Correct Answer
Arapid diffusion and amplification inside the cell
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