which of the following statements about heterotrimetric G proteins and their receptors is incorrect? A: when GTP binds to the alpha subunit of the G protein, the beta-gamma subunit dissociates from the alpha subunit B: G-protein coupled receptors contain nine transmembrane alpha helices C: binding of arrestin causes removal of the receptor from the membrane D: G protein- coupled receptors may be desensitized by serine phosphorylation I had chosen option A and got it wrong. What is the Correct answer and explain how it is. Also, where did i go wrong in choosing option A?

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.