- The nucleus is the most prominent organelle in an animal cell. It contains chromosomes, nucleolus, nuclear bodies, and nucleosol. It is surrounded by a nuclear envelope (also called nuclear membrane) that is perforated with nuclear pores. Since it contains most of the genetic material of an animal, it is regarded as the control center of the cell, regulating most of the cell’s activities such as metabolism, growth, and reproduction. It does so by regulating gene expression.
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