Researchers studying olfactory and taste receptors have stumbled upon an unusual phenomenon. These receptor proteins are sometimes expressed in other animal tissues in addition to the nose or tongue. For example, the sweet taste receptor T1R2 is expressed in the pancreas. Suggest the best possible explanation for these findings.
A. Techniques used to visualize protein expression are imperfect and may lead to false positive results.
B. Control of protein expression is imperfect. As long as a receptor doesn't interfere with organ function, expression will not be selected against.
C. Chemoreceptors bind molecules that help the body sense and respond to internal phenomena, such as sugar levels in the blood.
D. Damaged receptors are recycled by the body and end up in waste-disposal organs.
Answer: C
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