When Adenylate Cyclase Is Activated by a Hormone, the Concentration

question 19

Multiple Choice

When adenylate cyclase is activated by a hormone, the concentration of cyclic AMP increases in the cell even though the hormone does not enter the cell. This is an example of the __________________ mechanism of hormone action.

• A) altering membrane transport
• B) altering activity of DNA
• C) second messenger
• D) all of above

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