What is a role of calcium ions in the second-messenger cascade involving phospholipase C, diacylglycerol, and inositol trisphosphate?
A. It splits and activates G-protein subunits.
B. It phosphorylates cell proteins.
C. It binds to the endoplasmic reticulum and causes the release of inositol trisphosphate.
D. Along with diacylglycerol, it activates protein kinase C.
E. It is the first messenger that binds to the integral membrane protein receptor.
Answer: D
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