Nucleus definition biology

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Function The key function of the nucleus is to control cell growth and multiplication. This involves regulating gene expression, initiating cellular reproduction, and storing genetic material necessary for all of these tasks. In order for a nucleus to carry out important reproductive roles and other cell activities, it needs proteins and ribosomes. Nucleoplasm Nucleoplasm is the gelatinous substance within the nuclear envelope. Also called karyoplasm, this semi-aqueous material is similar to cytoplasm in that it is composed mainly of water with dissolved salts, enzymes, and organic molecules suspended within. The nucleolus and chromosomes are surrounded by nucleoplasm, which cushions and protects nuclear contents. Nucleolus Contained within the nucleus is a dense,membrane-less structure composed of RNA and proteins called the nucleolus. The nucleolus contains nucleolar organizers, the parts of chromosomes carrying the genes for ribosome synthesis. The nucleolus helps to synthesize ribosomes by transcribing and assembling ribosomal RNAsubunits. These subunits join together to form ribosomes during protein synthesis. Bailey, Regina. "The Cell Nucleus." ThoughtCo, Apr. 5, 2023, thoughtco.com/the-cell-nucleus-373362. Bailey, Regina. (2023, April 5). The Cell Nucleus. Retrieved from https://www.thoughtco.com/the-cell-nucleus-373362 Bailey, Regina. "The Cell Nucleus." ThoughtCo. https://www.thoughtco.com/the-cell-nucleus-373362 (accessed June 15, 2023).