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CONCEPT CHECK 23-4 When some cells are treated with growth factors that act through receptor tyrosine...

CONCEPT CHECK 23-4

When some cells are treated with growth factors that act through receptor tyrosine kinases, they divide rapidly. These cells are also known to be able to respond to the hormone epinephrine, which leads to the activation of adenylyl cyclase. In addition, it is known that protein kinase A (PKA) inhibits the protein Raf in these cells. Based on this information, how do you predict that cells treated with growth factor alone will compare with cells treated simultaneously with both epinephrine and growth factor? Explain your reasoning.

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