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The G-proteins bind only to _________________

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The G-proteins bind only to _________________

(a) cytosine

(b) guanine

(c) thymine

(d) adenine

This question was addressed to me in class test.

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

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Correct answer is (b) guanine

The best I can explain: The G-proteins are called so because they bind only to the guanine nucleotides – GTP (guanosine triphosphate) and GDP (Guanosine diphosphate). The protein is heterotrimeric and consists of three different polypeptides subunits.

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