Tasting involves many different cell-signaling processes that ultimately generat

Question

Tasting involves many different cell-signaling processes that ultimately generate nerve signals transduced by membrane depolarization. Sweet tastes result in PIP_2 hydrolysis, while salty tastes allow sodium ions to directly alter the membrane potential. What can you deduce about the signaling mechanisms for sweet and salty? Sodium ions directly enter the cells, indicating the signal is transduced by an ion channel. Sweet and salty signaling pathways use the same taste receptor molecule, but with different efficacy on the sweet and salty taste center in the brain. Sweet ligands bind to and close sodium channels, which starts a membrane potential. Sweet utilizes the GPCR signaling pathway, activating phospholipase C.

Explanation / Answer

B, Sweet and salty signalling pathways use the same taste receptor molecule, but with different efficacy on the swet and salty taste center in t

C. Sweet ligands bind to and close sodium channels, which starts a membrane potential.

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