Question

which of the following is not a characteristic of olfactory receptor cells?
they have a short life span of about 60 days.
they are ciliated.
they are chemoreceptors.
they are unipolar neurons.

Explanation:

To determine the answer, we analyze each option:

• Olfactory receptor cells have a short lifespan (around 60 days) as they are replaced regularly.
• They are ciliated to detect odor molecules.
• They are chemoreceptors as they respond to chemical stimuli (odorants).
• Olfactory receptor cells are bipolar neurons, not unipolar. So "They are unipolar neurons" is not a characteristic.

Answer:

D. They are unipolar neurons (assuming the options are labeled A - D as: A. They have a short life span of about 60 days, B. They are ciliated, C. They are chemoreceptors, D. They are unipolar neurons)