The nucleus is the “control center” of a cell. It contains most of the genes in eukaryotes and is separated from the rest of the cell by a double membrane. Much like the cytoskeleton, the nucleus has a nuclear lamina that maintains the shape. Chromosomes form of chromatin when the cell is dividing. Humans have 23 pairs of chromosomes. Inside the nucleus, there is a region of densely stained fibers and granules, called the nucleolus. The nucleus is responsible for creating material (RNA) that is used in synthesizing proteins.
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