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G-protein coupled receptors contain ________ transmembrane alpha helices.

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G-protein coupled receptors contain ________ transmembrane alpha helices.

(a) 2

(b) 5

(c) 7

(d) 9

The question was posed to me in exam.

I would like to ask this question from Cell Signaling Systems topic in portion Cell Signaling and Signal Transduction of Cell Biology

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Right option is (c) 7

The explanation: The G-protein coupled receptors (GPCRs) are a family of cell surface receptors that consist of 7 transmembrane alpha helices. These receptors translate the binding of extracellular messengers to the activation of intracellular GTP-binding proteins.

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