Microfilaments differ from microtubules in that microfilaments
A) are thicker than microtubules.
B) are found only in plants, whereas microtubules are found in both plant and animal cells.
C) are mainly composed of actin, whereas microtubules are composed of tubulin.
D) help to anchor organelles, whereas microtubules primarily function to help cells change shape and move.

Question

Quizplus · Accepted Answer

Microfilaments are mainly composed of the protein actin, while microtubules are composed of the protein tubulin.

Answer: D 
 Microfilaments help anchor organelles and maintain cell shape, while microtubules primarily function to help cells change shape and move. Microtubules also aid in cell division and the transport of organelles within cells.

Microfilaments Differ from Microtubules in That Microfilaments