Which of the following steps amplify the epinephrine signal response in cells: receptor activation of G protein,

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Which of the following steps amplify the epinephrine signal response in cells: 

receptor activation of G protein, G protein activation of adenylyl cyclase (AC), cAMP activation of PKA, or PKA phosphorylation of glycogen phosphorylase kinase (GPK)? 

Which change will have a greater effect on signal amplification: an increase in the number of epinephrine receptors or an increase in the number of Gas proteins?

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Molecular Cell Biology

ISBN: 978-1429234139

7th edition

Authors: Harvey Lodish, Arnold Berk, Chris A. Kaiser, Monty Krieger, Anthony Bretscher, Hidde Ploegh, Angelika Amon, Matthew P. Scott

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