1. Tardigrade
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  4. Spindle fibre is made up of

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Q. Spindle fibre is made up of

UP CPMTUP CPMT 2008

Solution:

Electron microscope studies show that the spindle fibre consists of a bundle of microtubules embedded in a protein matrix. Microtubules are long cylinder. The wall of the cylinder is electron dense and is approximately $50-70 \,\mathring{A}$ thick. The wall is made up of 13 longitudinally arranged filamentous subunits. The filaments appear to be made up of small monomer of globular protein-tubulin about $40-50\,\mathring{A}$ in diameter.