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Mahalo biology expert Mary Poffenroth tells you what you need to know about the cell nucleus.
The nucleus is where most of the DNA in eukaryotic organisms is stored within a cell. Within the nucleus is the nucleolus, where ribosomes are made. The nucleus is surrounded by a double outer membrane with pores that allow for the movement between the cytoplasm and the nucleus.
Long strands of DNA in the nucleus combine with special proteins to form a long fiber called chromatin. The chromatin is then used to create chromosomes. The number of chromosomes in each cell depends on the species in question.
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