【判断题】The receptor may activate, via a G protein, the plasma membrane enzyme phospholipase A, which catalyzes the formation of diacylglycerol (DAG) and inositol trisphosphate (IP3).
【单选题】Which kind of lipid is almost distributed at the inner side of plasma membrane and related to the generation of the secondary messengers---diacylglycerol and inositol triphosphate? ( )