Second messengers, DAG and IP3 are formed from: (A) Phosphatidyl choline, (B) Phosphatidyl ethanolamine, (C) Phosphatidyl serine, (D) Phosphatidyl inositol
Answer is D. Phosphatidylinositol Is a Precursor of Second MessengersThe G proteins activate phospholipase C, which hydrolyzes phosphatidylinositol4,5-bisphosphate to produce diacylglycerols and the water-soluble second messenger inositol 1,4,5-triphosphate (IP3).Ref: Harper&;s Biochemistry; 30th edition; Chapter 54; White Blood Cells