Which of the following is characteristic of cilia?
A. They move substances in any direction across cell surfaces.
B. They are substantially longer than flagella, and are most easily seen in human sperm cells.
C. They are used for cellular adhesion.
D. They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells.
Answer: D. They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells.
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