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1. Dictionary

   nu·cle·us

   /ˈno͞oklēəs/

   noun

   • 1. the central and most important part of an object, movement, or group, forming the basis for its activity and growth: "the nucleus of a film-producing industry" Similar corecentercentral partmost important partheartnubhubmiddlemidpointeyekernelfocusfocal pointpivotcruxliterary:navelrare:omphalos
   • 2. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
   • ▪ a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
   • ▪ a discrete mass of gray matter in the central nervous system.
   • ▪ the solid part of the head of a comet.

   Word Origin mid 17th century (denoting the solid part of a comet's head): from Latin, literally ‘kernel, inner part’, diminutive of nux, nuc- ‘nut’.

   Scrabble Points: 9

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2. byjus.com › biology › the-nucleusWhat is a Nucleus?- Structure and Function of Nucleus - BYJU'S

   byjus.com › biology › the-nucleus

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   A nucleus is defined as a double-membraned eukaryotic cell organelle that contains the genetic material. A nucleus diagram highlighting the various components. Moreover, only eukaryotes have the nucleus, prokaryotes have the nucleoid.

3. www.britannica.com › science › nucleus-biologyNucleus | Definition, Function, Structure, & Facts | Britannica

   www.britannica.com › science › nucleus-biology

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   Sep 18, 2024 · Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes.

4. www.sciencefacts.net › cell-nucleusCell Nucleus: Definition, Structure, & Function, with Diagram

   www.sciencefacts.net › cell-nucleus

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   Feb 4, 2021 · Nucleus is a membrane-bound organelle that houses DNA, the genetic material of a eukaryotic cell whereas nucleolus is a sub-organelle found within the nucleus containing RNA and is responsible for ribosome synthesis.

5. biologydictionary.net › cell-nucleusCell Nucleus (Plant & Animal) - Definition and Function | Biology

   biologydictionary.net › cell-nucleus

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   Oct 4, 2019 · The cell nucleus is a large organelle in eukaryotic organisms which protects the majority of the DNA within each cell. The nucleus also produces the necessary precursors for protein synthesis. The DNA housed within the cell nucleus contains the information necessary for the creation of the majority of the proteins needed to keep a ...

6. www.merriam-webster.com › dictionary › nucleusNucleus Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › nucleus

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   : a cellular organelle of eukaryotes that is essential to cell functions (such as reproduction and protein synthesis), is composed of nucleoplasm and a nucleoprotein -rich network from which chromosomes and nucleoli arise, and is enclosed in a definite membrane see cell illustration. b.

7. www.biologyonline.com › dictionary › nucleusNucleus - Definition and Examples - Biology Online Dictionary

   www.biologyonline.com › dictionary › nucleus

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   Sep 1, 2023 · A nucleus is a large double-membraned organelle that is sometimes referred to as the “central unit ” of the cell because it contains the chromosomes that bear the genetic material. It is not found only in eukaryotic cells and not in prokaryotic cells.

8. biologynotesonline.com › nucleus-structure-and-functionsNucleus – Definition, Structure, Diagram, and Functions

   biologynotesonline.com › nucleus-structure-and-functions

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   Apr 8, 2024 · The nucleus, a pivotal organelle within eukaryotic cells, serves as the repository for genetic material. Encased by a double-layered structure known as the nuclear envelope, it ensures the segregation of the nucleoplasm from the cytoplasm.

9. dictionary.cambridge.org › dictionary › englishNUCLEUS | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   NUCLEUS definition: 1. the central part of an atom, usually made up of protons and neutrons 2. the part of a cell that…. Learn more.

10. www.thoughtco.com › the-cell-nucleus-373362The Nucleus - Definition, Structure, and Function - ThoughtCo

    www.thoughtco.com › the-cell-nucleus-373362

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    Nov 6, 2019 · The cell nucleus is a membrane-bound structure that contains a cell's hereditary information and controls its growth and reproduction. It is the command center of a eukaryotic cell and is usually the most notable cell organelle in both size and function. Function. The key function of the nucleus is to control cell growth and multiplication.

11. bio.libretexts.org › Bookshelves › Introductory_and_General_Biology3.3: The Nucleus - Biology LibreTexts

    bio.libretexts.org › Bookshelves › Introductory_and_General_Biology

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    The nucleus is the hallmark of eukaryotic cells; the very term eukaryotic means having a "true nucleus".