43. Endocrine System
Endocrine System
Multiple Choice
Multiple ChoiceBecause most chemical signals are unable to pass through the plasma membrane, the cellular action they initiate results from __________.
A
ligand binding
B
direct stimulation of the cell's DNA
C
the enzymatic behavior of the signal molecule
D
binding to intracellular receptors
E
the activation of a signal transduction pathway
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