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A signal transduction cascade amplifies a signal because each step

  • A.activates many molecules at the next stage
  • B.removes one molecule from the pathway
  • C.requires a fresh signal molecule to proceed
  • D.reverses the effect of the step before it

Answer: A

One activated receptor can switch on many G proteins, each of which makes many second messenger molecules, so a handful of hormone molecules produce a large response. Amplification is the point of having a cascade at all.

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