Cell Nucleus. N Cell Biology, The Nucleus Is A Membrane-Enclosed Organelle Found In Eukaryotic Cells. Eukaryotes Usually Have A Single Nucleus, But A Few Cell Types, Such As Mammalian Red Blood Cells, Have No Nuclei, And A Few Others Have Many. Cell Nuclei Contain Most Of The Cell's Genetic Material, Organized As Multiple Long Linear Dna Molecules In Complex With A Large Variety Of Proteins, Such As Histones, To Form Chromosomes. The Genes Within These Chromosomes Are The Cell's Nuclear Genome And Are Structured In Such A Way To Promote Cell Function.

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