Why Do Some Signals ("First Messengers") Trigger "Second Messengers" to Activate

question 9

Multiple Choice

Why do some signals ("first messengers") trigger "second messengers" to activate target cells?

• A) The first messenger requires activation by ATP.
• B) The first messenger is not water soluble.
• C) The first messenger binds to many types of cells.
• D) The first messenger cannot cross the plasma membrane.
• E) There are no receptors for the first messenger.

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