1. Five different types of taste receptors have been identified in humans. These
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1. Five different types of taste receptors have been identified in humans. These are salty, sour, sweet, bitter and umami. Taste receptors consist of specific types of proteins incorporated into the plasma membrane of taste receptor which are clustered together in structures called taste buds. All five receptor types are present in each taste bud, whieh are distributed over most of the tongue surface arca. Olfactory recepto several thousand different types, each type specific for a different type of odorant molecule (ligand). rs are located in the nasal cavity, and consist of a) If you plug your nose, red wine and black coffee taste exactly the same. Explain why this is so. (2 pts) ) Many diverse types of molecules are perceived as sweet, including different types of sugars and artificial sweeteners. Provide a molecular explanation for why this is possible, given that there is only one type of "sweet" taste receptor (that we know of). (2 pts).Explanation / Answer
a) The red wine and black coffee if they are at same temperature will taste the same when nose is blocked. This is because, the gustatory sensation requires the co-ordination of both the olfactory (aroma) and taste sensation. Aroma sensation gets affected when nose is blocked and therefore red wine and black coffee taste the same.
b) Eventhough there is only one kind of sweet receptor, diverse sensation of sweet is perceived depending upon the intensity of stimulus and interaction with other receptors and difference in aroma (olfaction).
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