Colchicine is a cellular toxin known to bind to beta-tubulin, preventing its ability to interact with alpha-tubulin. Cytochalasin is a toxin that binds to G-actin, preventing its ability to polymerize. If a cell process is disrupted by colchicine but not by cytochalasin, one can conclude that the cell process requires

Explanation:

Colchicine is a microtubule specific drug whereas cytochalasin is a drug that blocks polymerization of actin filament and blocks cell division in animals

Colchicine tightly binds with free tubulin dimer and prevent its polymerization, in this case mitotic spindle apparatus does not assemble (disappear) and cell unable to do partitioning of chromosomes into two groups and thus arrest cell division

If cell is disrupted by colchicine but not by cytochalasin, cell division will be arrested and cell process will not occur

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