Ranking the cytoskeletal fibres from narrowest to widest gives:
AMicrotubule, microfilament, intermediate
BIntermediate, microtubule, microfilament
CMicrofilament, intermediate, microtubule
DMicrotubule, intermediate, microfilament
Answer & Solution
Correct answer: C. Microfilament, intermediate, microtubule
1. Each fibre class has a characteristic diameter.
2. Microfilaments have a diameter of about 7 nm and are the narrowest.
3. Intermediate filaments get their name because their diameter, 8 to 10 nm, sits between the other two.
4. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton.
5. So the order runs microfilament, intermediate filament, microtubule.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 4 'Cell Structure', sections 4.1-4.6_
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