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Solution


Q.

Microtubules are the constituents of            [2016]
1 centrioles, spindle fibres and chromatin  
2 centrosome, nucleosome and centrioles  
3 cilia, flagella and peroxisomes  
4 spindle fibres, centrioles and cilia  

Ans.

(4)

Microtubules are unbranched hollow submicroscopic tubules of protein tubulin which develop on specific nucleating regions. It can undergo quick growth or dissolution at their ends by assembly or disassembly of monomers. They are present in the cytoplasm as well as in specialised structures like centrioles, basal bodies, cilia or flagella, sensory hair, equatorial ring of thrombocytes, spindle apparatus, chromosome fibres, nerve processes, sperm tails, axostyle of parasitic flagellates, fibre system of Stentor, cytopharyngeal basket of Nassula, etc.