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Microfilaments are composed of

  • A.myosin
  • B.actin
  • C.tubulin
  • D.keratin

Answer: B

Globular actin monomers polymerise into a two-stranded helix about seven nanometres across. Myosin is the motor protein that walks along actin rather than a component of the filament itself, which is a distinction worth keeping clear.

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