Apentix/AP Biology/Unit 4: Cell Communication and Cell Cycle/Question
AP Biologymediummcq1 pt

A liver cell responds to epinephrine by breaking down glycogen. A single molecule of epinephrine can ultimately result in the breakdown of millions of glycogen molecules. Which mechanism best accounts for this observation?

Explanation

Core Concept

Signal amplification through phosphorylation cascades allows one signaling molecule to activate many downstream targets at each step, explaining the million-fold increase in glycogen breakdown.

Correct Answer

sig-amp-1

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