Which of the following statements is not true concerning olfactory cells?
A. Olfactory cells are modified neurons.
B. Olfactory cells end in a tuft of about five cilia.
C. Olfactory cells are located in the roof of the nasal cavity.
D. Each olfactory cell has its own individual neuron leading to the olfactory bulb.
E. Each olfactory cell has only one out of several hundred different types of receptor proteins.
Answer: D
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Genetic analysis indicates that North America was originally populated by three or four different
waves of immigrants who A. all came from Asia. B. came from Asia and Europe. C. came from Asia and Africa. D. all came from Africa. E. came from Africa and Europe.
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Bacterial plasmids often have genes that code for genetic exchange or antibiotic resistance
____________________ Indicate whether the statement is true or false.