New Findings On Sour Taste

link:http://www.sciencedaily.com/releases/2007/07/070709103854.htm

Summary:Food manufacturers may soon have more control over the amount of sour taste that comes through in a variety of acidified food products.Sour is one of only five primary human taste sensations, and is stimulated by organic acids. Some organic acids are naturally present in foods, such as the citric acid in oranges, malic acid in apples and, as a result of fermentation, the lactic acid in yogurt. These and other organic acids may also be used as food ingredients.

Organic Molecules
What is the major role of this molecule in the cell?taste
List three things you learned from this article in your own words.They are used in oranges, in yogurt, and in apples.
What impact would the absence of this molecule have on the cell? Some of the foods that we eat might have a different taste.