Question

Name this structure that is involved in the formation of spindle fibers during cell division.

Answer 1

Hint The structure which was shown in the figure is a cylindrical organelle which is composed mainly of a protein which is known as tubulin. Their main function is to produce cilia during interphase and the aster and the spindle during cell division.

Complete answer: Centrioles are found in most eukaryotic cells. A highly ordered mass of dense material is observed to always surround a pair of centrioles which is commonly known as the pericentriolar material (PCM), this makes up a structure which is known as a centrosome. Centrioles are made of nine sets of short microtubule triplets, arranged in a very cylinder. In the embryos of Crab and Drosophila the Deviations are seen from this structure with nine doublets, and nine singlets in Caenorhabditis elegans sperm cells and early embryos. Additional proteins include centrin, calnexin, and testing. The main function of centrioles is to supply cilia during interphase and therefore the aster and the spindle during cellular division.

Additional Information: The centrioles are mostly involved within the organization of the mitotic spindle and the completion of cytokinesis. The Centrioles were previously thought to be required for the formation of a mitotic spindle in animal cells. But as you all know that the newer experiments have cleared that cells whose centrioles are removed with the help of the laser ablation can still progress through the G1 stage of interphase before centrioles are often synthesized later during a de novo fashion. Additionally, the known mutant flies lacking centrioles develop normally, although the adult flies' cells lack flagella and cilia and as a result, they will die soon after birth. The centrioles can self replicate during cellular division.

Note: It was found that In non-dividing cells, centrioles also are involved within the formation of flagella and cilia. However, centrosomes are only involved in a cellular division where they form the spindle apparatus.