Multiple Choice
When a second message is necessary for extracellular communication to be activated, it is provided by:
A) guanosine triphosphate (GTP) .
B) adenosine monophosphate (AMP) .
C) adenosine triphosphate (ATP) .
D) guanosine diphosphate (GDP) .
Correct Answer:

Verified
Correct Answer:
Verified
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