volume_mute
Cytoplasmic protein fibers — name
publish date: 2026/06/16 20:56:50.249186 UTC
volume_mute
Within a cell's cytoplasm are many long, thin protein fibers that are only about six nanometers in diameter. Depending on local conditions in the cell, these can exist either as subunits or as filaments. What are these called?
Correct Answer
microfilaments
Explanation
Microfilaments are long, thin protein fibers about six nanometers in diameter found within the cytoplasm. They are composed primarily of the protein actin and function in maintaining cell structure, enabling cell movement, and are believed to be involved in cytoplasmic streaming. In more complex forms, they are associated with the contraction of some muscle cells.
Reference
Biology: A Self-Teaching Guide