
Concept explainers
Interpretation:
The better sense of smell of a dog needs to be explained with the help of receptor site theory.
Concept introduction:
As per receptor site theory smell of a substance is obtained when odoring molecule from the substance binds with the nasal receptor resulting a nerve impulse which reaches the brain.

Answer to Problem 6E
Dog has more number of nasal receptors than a person. That’s why dog has better sense of smell than a person.
Explanation of Solution
As dogs have huge number of nasal receptors so almost all types of molecules can be bound with the nasal receptor unlike a person who can smell only particular types of molecules for which nasal receptors are available.
As dogs have more number of nasal receptors, a dog has better sense of smell than a person.
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