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Example Question #181 : Other General Biology
Which of the following triggers "sour" taste receptors in taste buds?
Possible Answers:
Gustducin
Glutamate
Sodium ions
Hydrogen ions
Correct answer:
Hydrogen ions
Explanation:
Sour flavor taste bud receptors are triggered in the presence of hydrogen ions (thus acidic foods often have a sour taste). Sodium triggers receptors for salty flavor, while glutamate and gustducin (a guanine nucleotide-binding protein, or G protein), are associated with umami, sweet, and bitter flavors.
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