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  • Microtubules, actin filaments, and intermediate filaments make up a cell's cytoskeleton. These structures give the cell its shape and aid in the organisation of its components.
  • They also serve as a basis for cell division and motility. Cytoskeletal structures are fibrous or small tubular structures that act as supporting structures for cells. In 1928, Koltzoff coined the term "cytoskeleton."
  • Cytoskeletal structures are classified into three categories. Intermediate fibres include microtubules, microfilaments, and intermediate fibres. They are made up of proteins like tubulin, actin, desmin, and myosin, among others.

    The correct option is option B) Proteinaceous filaments.

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