[Campbell Biology P.166] Which of the following statements accurately describes intermediate... | Practice Question

Which of the following statements accurately describes intermediate filaments based on the provided text?

  • A: They are found in all eukaryotic cells, similar to microtubules and microfilaments.
  • B: They are more permanent structures within cells compared to microfilaments and microtubules.
  • C: Their primary role is in cell contraction and amoeboid movement.
  • D: Each type is constructed from diverse molecular subunits including tubulin.

Explanation

The text explicitly states: 'Intermediate filaments are more permanent fixtures of cells than are microfilaments and microtubules' and 'Intermediate filaments are only found in the cells of some animals, including vertebrates.' Tubulin is the subunit of microtubules, not intermediate filaments, which are made of proteins like keratins. Cell contraction and amoeboid movement are driven by actin and myosin microfilaments .