Microtubules are absent in
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The exact arrangement of protofilaments in the wall of amicrotubule is currently debated. ... In addition to the simple singlet structure, doublet or triplet microtubules are found in specialized structures such as cilia and flagella (doubletmicrotubules) and centrioles and basal bodies (triplet microtubules).
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Microtubules are made up of tubulin proteins which are spread in the cytoplasm and extend throughout the eukaryotic cell and some bacteria and archaea.
Microtubules help in the formation of pilli and flagella present on the bacterial surface which allow them to move around in their environment but microtubules are absent in mitochondria organelle that is present in animal and plant cells.
Microtubules play an important role in providing structural support to the cell, helps in the segregation of chromosomes during cell division and maintain the organelles at their position.
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