Signal Transduction The ion channel that opens in response to acetylcholine is a

Question

Signal Transduction The ion channel that opens in response to acetylcholine is an example of a signal transduction system. A. G protein B. ligand-gated C. voltage-gated D. serpentine receptor Which of the following is often involved in the process of signal transduction? A. Interactions between receptor and second messenger molecules B. Transport of signal molecules, for example hormones, across the membrane C. Activation of intracellular protein kinases. D. Increased production of carbohydrates in the nucleus Receptor tyrosine kinases A. are able to phosphorylate Ser and Thr in addition to Tyr. B. are activated by extracellular ligands. C. form transmembrane ion channels when activated D. are peripheral membrane proteins. Adenylyl cyclase is an enzyme that A. catalyzes the formation of cyclic AMP from ATP B. is stimulated by the activated G protein alpha subunit to produce cGMP C. is found free in the cytoplasm. D. interacts with the beta subunit of a trimeric G protein.

Explanation / Answer

1. B. ligand gated

2. B. transport of signal molecules, for example, hormones, across the membrane.

3. A. are able to phsphorylate Ser and Thr in addition to Tyr.

4. A. catalyses the formation of cyclic AMP from ATP

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