Biology 1001A Lecture Notes - Guanine, Nitrogenous Base

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Intermediate filaments are fibres that occur singly, in parallel bundles, either alone or in combination with microtubule, microfilaments , or both. Microfilaments are thin fibres that consist of two rows of protein subunits wound around each other in a long spiral. Motor proteins that push or pull along microtubules or microfilaments . One end of a motor protein is firmly fixed to a cell structure such as a vesicle , a microtubule , or a microfilaments. The other end has reactive groups that walk along another microtubule or microfilament by making an attachment, forcefully swivelling a short distance , and then releasing . The major components of the cytoskeleton as visualized by specific staining and light microscopy (top) and molecular models (bottom). (a) microtubules are stained yellow in a pancreatic cell. Microtubules are assembled from individual tubulin subunits. (b) intermediate filaments assembled from keratin proteins in cells of the kangaroo rat. The nucleus is stained blue in these cells.

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