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Example Question #21 : Protein Structure And Functions
Which of the following lists the cytoskeletal filaments in order of increasing diameter?
Possible Answers:
Microtubules < actin filaments < intermediate filaments
Intermediate filaments < actin filaments < microtubules
Actin filaments < intermediate filaments < microtubules
Microtubules < intermediate filaments < actin filaments
Actin filaments < microtubules < intermediate filaments
Correct answer:
Actin filaments < intermediate filaments < microtubules
Explanation:
Actin filaments, also known as microfilaments, are flexible and bundle up, and are 5-9nm in diameter. Intermediate filaments, which can strengthen cells, are about 10nm. Microtubules, rigid and attached on one end to a centrosome, are 25nm.
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