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The three principal filament systems of the eukaryotic cytoskeleton are

  • A.microfilaments, intermediate filaments and microtubules
  • B.collagen, elastin and keratin fibres of the extracellular matrix
  • C.cilia, flagella and the crawling pseudopodia
  • D.actin, myosin and troponin contractile filaments

Answer: A

They differ in diameter, in the protein from which each is built and in the jobs they do. Collagen and elastin lie outside the cell in the extracellular matrix rather than within the cytoplasm, so they are not part of the cytoskeleton at all.

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