Tubulin protein is not present in......

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(A) Tubulin is a globular protein that polymerizes to form microtubules,which are essential components of the cytoskeleton. Microtubules are involved

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Cell membrane

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(A) Tubulin is a globular protein that polymerizes to form microtubules,which are essential components of the cytoskeleton. Microtubules are involved in various cellular processes such as intracellular transport,maintaining cell shape,and the formation of the mitotic spindle during cell division (cytokinesis). Pinocytosis is a process of endocytosis where the cell membrane invaginates to ingest extracellular fluid; while the cytoskeleton (containing tubulin) may assist in the movement of vesicles,tubulin itself is not a structural component of the cell membrane. Therefore,tubulin protein is not present in the cell membrane.

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