Which of these statements about taste is true? a. Sweetness is a measure of the concentration of hydrogen ions in food. b. Sodium ions from foods can directly depolarize certain taste cells. c. All bitter-tasting compounds have a similar chemical structure. d. Sourness is detected when hydrogen ions bind to membrane receptors.

Video transcript

Welcome back. Let's look at our next question here. It says bitter taste and is used to identify and we've got choices of carbohydrates, poisonous compounds, sodium ion concentration or electrolytes in the food. Well the bitter taste is a benefit to us to taste because it helps us identify poisonous compounds and avoid them. So Choice B would be our answer here. But let's think about our other answer choices. Choice A says carbohydrates such as glucose um carbohydrates, glucose, we can think sugar and of course that has a sweet taste. So the sweet taste helps us to identify carbohydrates in our food. But obviously not an answer to this question. Choice C. Says sodium ion concentration um that we would identify with the salty taste um letting us know that the food contains sodium ions. But not our answer to this question. And choice d electrolytes in the food. Um That would also be the salty taste. Um The salty taste receptors respond to alkaline metal ions. So not our answer here. You might notice. We're also um not one of our questions choices but we also have taste buds that recognizes sour taste and that is triggered by hydrogen ions or letting us know the food is acidic. So again the sour taste buds recognize hydrogen ions but we're looking for the bitter taste that used to identify it would be choice be poisonous compounds. See you in the next video