Structural characteristics:

Microtubules are filamentous intracellular structures that are answerable for different sorts of developments in every eukaryotic cell. Microtubules are associated with nucleic and cell division, an association of intracellular structure, and intracellular vehicle, just as ciliary and flagellar motility. Since the elements of microtubules are so basic to the presence of eukaryotic cells (counting our own), it is significant that we comprehend their structure, how they are amassed and dismantled, and how their gathering/dismantling and capacities are directed by cells.

Function: 

Microtubules are like conveyor belts system inside the cells. They transport vesicles, granules, organelles like mitochondria, and chromosomes by means of exceptional connection proteins. They additionally serve a cytoskeletal job. Basically, they are direct polymers of tubulin which is a globular protein. 

Unique characteristics: 

Microtubules are long slim structures that comprise of the protein tubulin and ordinarily have a width of around 25 nm. Attributes of microtubules that are significant for their capacities incorporate Long unbending shape - which empowers microtubules to help different structures inside the cell. 

Reference  

https://www.ncbi.nlm.nih.gov/pubmed/2661457