Although Humans Produce Only 400 Olfactory Receptor Proteins, We Able

Although humans produce only 400 olfactory receptor proteins, we able to discriminate possibly 1 trillion odors because

A) each odor activates a characteristic combination of different kinds of receptor molecules.
B) each odor is broken down into its component parts.
C) we have many specific genes per receptor.
D) olfactory neurons are continually replaced through adulthood.

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