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. | Numerade
Why do some signals ("first messengers") trigger "second me…
Jun 3, 2020
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