Question

Distinguish between
Microbules and microfilaments

Answer 1

Microtubules	Microfilaments
They are non-contractile though change in length can occur through assembly and disassembly of constituent proteins.	They are cocntractile.
A microtubule contains 13 protofilaments.	They do not possess longitudinal subunits.
They are hollow tubules.	They are solid structures.
They are formed of $\alpha$ and $\beta$- tubulin.	They are made up of actin protein.
The diameter of a microtubule is 25 nm.	The diameter of a microfilament is 6 nm.
Microtubules occur in centrioles, basal bodies, cilia/flagella, astral rays, spindle fibre.	They occur below cell membrane and at the interphase of plasmagel-plasmasol.
Microtubules cause microcirculation by directing vesicles to particular direction.	Microfilaments are believed to cause cytoplasmic streaming.
Microtubules have no role in endocytosis but direct endosomes in particular direction.	They take part in endocytosis.