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A host of fractionation procedures are employed by cell biologists. Each organelle has characteristics (size, shape and density for example) which make it different from other organelles within the same cell.
Importance: Question: Methods: For a group of cells that rarely complete the cell cycle, we expect a high proportion of cells to be in the resting stage of the cell cycle (G1). However, in a rapidly dividing cell population, we expect a high proportion of cells to be in the stage of mitosis. One way to quantify cell division is by using the mitotic index: Methods: For example, the mitotic index can be used to examine cell proliferation in primary root tissue. The number of cells in mitosis were counted for cells from different regions of the primary root tissue.