Which of the following statements correctly describes intermediate filaments? a. they are the only cytoskeletal filaments that are not composed of protein. b. intermediate filaments are the principal component of the cell cortex. c. these filaments are always found outside of the cell. d. these filaments the cell to withstand mechanical stress. e. none of the above answers are correct

d. These filaments help the cell to withstand mechanical stress.

Explanation:

Intermediate filaments are the rope like fibers. These filaments form an extensive network ranging from the nucleus to the plasma membrane thus these filaments entirely cover the cytoplasma of the cell. These are developed from the cytoskeletal proteins. They have a diameter that is intermediate between thick and thin myofibrils. The diameter of the myofibril is in between 10 to 12 nm. They stabilize the nucleus. The main function of the intermediate filaments is to provide mechanical strength to the cells that will help them to withstand stress during stretching, elongation and changing shape.