Question

Microtubules are constituents of :

• A. Centrosome, nucleosome and centrioles
• B. Cilia, flagella and peroxisomes
• C. Spindle fibres, centroiles and cilia
• D. Centrioles, spindle fibres and chromatin

Answer 1

Answer: (C)

Spindle fibres, centroiles and cilia

Microtubules are unbranched hollow submicroscopic tubules of protein tubulin which develop on specific nucleating regions and can undergo quick growth or dissolution at their ends by assembly or disassembly of monomers. With the exception of Slime Moulds and Amoebae, microtubules occur widely in eukaryotic cells. They are present in the cytoplasm as well as in specialized structures like centrioles, basal bodies, cilia or flagella, sensory hair, equatorial ring of thrombocytes, spindle fibres, chromosome fibres, etc.