Question 5 / 12:  Where do DAG and IP3 originate?
a.  They are formed by phosphorylation of cAMP.
b.  They are ligands expressed by signaling cells.
c.  They are hormones that diffuse through the plasma membrane to stimulate protein production.
d.  They are the cleavage products of the inositol phospholipid, PIP2.
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Biology 09 Cell Communication MCQ

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