Which of the following is not a common intracellular second messenger?
a. inositol 1,4,5-trisphosphate (ip3)
b. adenosine triphosphate (atp)
c. 1,2 diacylglycerol (dag)
d. 3'-5' cyclic guanine monophosphate (cgmp)

b. adenosine triphosphate (ATP) is not a common intracellular  secondary messenger.

Explanation:

Intracellular second messenger molecules are released in response of exposure to extracellular  signalling molecules. Examples are inositol 1,4,5-trisphosphate (IP3) , adenosine monophosphate (AMP) ,1,2 diacylglycerol (DAG) , 3'-5' cyclic guanine monophosphate (cGMP)

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the answer is cell division : )