Final answer:
The statement that the cytoskeleton is found in all living cells is incorrect; it is specific to eukaryotic cells. The cytoskeleton comprises microtubules, microfilaments, and intermediate filaments, each performing vital functions in maintaining cell shape, enabling movement, and organizing cellular components.
Step-by-step explanation:
The statement "Found in all living cells" is NOT true of the cytoskeleton. The cytoskeleton is a cellular structure found in eukaryotic cells, not in all living cells, as prokaryotic cells lack a defined cytoskeleton. The cytoskeleton is made up of microtubules, microfilaments, and intermediate filaments, each playing distinct roles in the cell.
Microtubules are hollow cylinders, made from alpha and beta tubulin dimers, that help maintain the cell's shape, allow organelle movement, and are responsible for chromosome movements during cell division. They can be found stemming from an area near the nucleus called the centrosome and are essential components of cilia and flagella.
Microfilaments, primarily composed of actin, are concentrated beneath the cell membrane and are essential for cell movement and shape. They participate in muscle contraction through interaction with myosin and form structures such as microvilli and pseudopodia in certain cell types.
Lastly, intermediate filaments, which vary in composition between different cell types, provide cellular structural support and help anchor organelles.