Multiple Choice
Most mammals have 1000 or more genes that encode receptor proteins on the surface of odor-receptor neurons, so why do some mammals have a better sense of smell than others?
A) Some of the genes actively transcribing receptor proteins in some species are completely absent in other species.
B) Some of the genes that code for receptor proteins may have been mutated and rendered inactive in some species but not in others.
C) Some species, particularly humans, rely much less on odor detection for survival; thus, the genes have mutated to encode proteins that aid in other senses, such as sight.
D) Some species of mammals have a larger set of "basic odors" than other species.
Correct Answer:
Verified
Correct Answer:
Verified
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