Choose the correct statement concerning second messengers. A) Lipid derived second messengers are produced by enzymes called cyclases. B) cAMP is a second messenger made by receptor tyrosine kinases. C) PIP₃ induces the release of Ca²⁺ from the intracellular stores. D) DAG and IP₃ are derived from the membrane phospholipid PIP₂.

Question

Quizplus · Accepted Answer

DAG and IP₃ are examples of lipid derived second messengers that are produced by the cleavage of the membrane phospholipid PIP₂. Choice A is incorrect because cyclases produce cyclic nucleotide second messengers, not lipid derived ones. Choice B is incorrect because cAMP is produced by adenylate cyclase, not receptor tyrosine kinases. Choice C is incorrect because there is no such molecule as PIP₃, and therefore it cannot induce the release of Ca²⁺ from intracellular stores.

Choose the Correct Statement Concerning Second Messengers