Practice question · Numerical answer
Microtubules are about 25 nm in diameter and microfilaments about 7 nm. How many times wider is a microtubule, to one decimal place?
Hints
- Divide the larger diameter by the smaller.
- Compute 25 divided by 7.
Show the answer
3.6 (answers within ±0.15 count)
Why
times wider. The difference matters mechanically: a wider hollow tube is far stiffer in bending, which is why microtubules serve as tracks and spindle fibres while thin actin filaments handle deformation.
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