Which of the following statements about the cytoskeleton is true?
A) The cytoskeleton of eukaryotes is a static structure most resembling scaffolding used at construction sites.
B) Although microtubules are common within a cell, actin filaments are rarely found outside of the nucleus.
C) Movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other.
D) Chemicals that block the assembly of the cytoskeleton would have little effect on a cell's response to external stimuli.

Question

Quizplus · Accepted Answer

Movement of cilia and flagella, which are responsible for motility in many eukaryotic organisms, is achieved through motor proteins called dynein arms that cause microtubules to slide against one another. The other statements are all false: the cytoskeleton is dynamic and constantly being remodeled to meet the needs of the cell; actin filaments are very common in the cytoplasm and form many structures; and disrupting the cytoskeleton can have profound effects on a cell's response to external stimuli.

Which of the Following Statements About the Cytoskeleton Is True