Final answer:
In vertebrates, each odorant receptor protein can bind only a single odorant.
Step-by-step explanation:
The statement is true. In vertebrates, such as humans and dogs, each odorant receptor protein can bind only a single odorant.
This means that different types of odorant receptors are required to detect different odors. Humans have about 350 olfactory receptor subtypes, while most dogs have about 1 billion receptors and bloodhounds have about 4 billion receptors.