The process whereby molecules in vesicles are exported out of the cell is called a) diffusion b) endocytosis c) exocytosis d) osmosis

The correct answer is option c. Exocytosis.

The exocytosis is a process, by which the cells transport their secretions out of the cells in a membrane bound vesicle. The exocytosis generally transports the water-soluble molecules out of the cell. The products present in the membrane bound vesicle, which is transferred is released outside the body of the cells.  

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.