Q:

An amino acid based hormone binds to its receptor. This has the effect of:

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An amino acid based hormone binds to its receptor. This has the effect of:


  1. activating an enzyme to produce cAMP
  2. causing it to diffuse through the cell to trigger a cascade of reactions
  3. activate a G-protein
  4. allowing it to move along the membrane

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C: After a hormone binds to its receptor, a G (for guanine) protein is activated as the fi rst effect. The G-protein then moves along the membrane to activate an enzyme that produces – for example – cAMP, which is a “second messenger”. 

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