Problem: Which of the following is characteristic of cilia? a) They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells. b) They are used for cellular adhesion. c) They are substantially longer than flagella, and are less common than flagella in humans. d) They move substances in many directions across a cell's surfaces.

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a) They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells.

TRUE. Cilia occurs in large numbers on cells while there's usually only 1 flagella on cells.

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Problem Details

Which of the following is characteristic of cilia? 

a) They are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells. 

b) They are used for cellular adhesion. 

c) They are substantially longer than flagella, and are less common than flagella in humans. 

d) They move substances in many directions across a cell's surfaces.