Nucleus

nucleus
central portion of a cell; specialized, central, and organized structure found in most cells containing the chromosomes
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Pronucleus
[Gr. pro- - a prefix meaning before, in front of; L. nux - nut]. The haploid, or reduced, nucleus of a gamete (ie. sperm and egg). The reduced nuclei of the sperm and egg join together in the fertilized ovum to form the zygote.
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Definition of nucleus :
1. The membrane bound organelle containing the genome of eukaryotes organized into chromosomes.
2. The center portion of an atom which contains the protons and neutrons.
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Definition: The nucleus is a membrane bound structure that contains the cell's hereditary information and controls the cell's growth and reproduction. It is commonly the most prominent organelle in the cell.
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The nucleus contains the chromosomes of the cell. Each chromosome consists of a single molecule of DNA complexed with an equal mass of proteins. Collectively, the DNA of the nucleus with its associated proteins is called chromatin.
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The nucleus, being the largest organelle, varies in diameter from 10 to 20 micrometres. It is enclosed by a double membrane called the nuclear envelope. The inner and outer membrane fuse at regular intervals, forming nuclear pores.
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The nucleus of a sperm or an egg prior to fertilization. Sperm and egg cells carry half the number of chromosomes of other nonreproductive cells.
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Nucleus The cellular organelle in eukaryotes that contains most of the genetic material. Updated 26-Aug-06
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Nucleus
The nuclei can be seen in the photograph of human cheek cells below.
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nucleus (cell) The largest, most prominent organelle in eukaryotic cells; a round or oval body that is surrounded by the nuclear envelope and contains the genetic information necessary for control of cell structure and function. PICTURE ...
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nucleus - prominent membrane-bound organelle in a eucaryotic cell, containing DNA organized into chromosomes.
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nucleus: the organelle within eukaryotic cells that contains the genetic material, DNA.
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nucleus -- Membrane-bound organelle which contains the DNA in the form of chromosomes. It is the site of DNA replication, and the site of RNA synthesis.
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nucleus
[L. a kernel]
(1) An atom's central core, containing protons and neutrons. (2) The chromosome-containing organelle of a eukaryotic cell. (3) A cluster of neurons.
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nucleus Cell nucleus; a spheroid body within a cell, contained in a double membrane, the nuclear envelope, and containing chromosomes and one or more nucleoli. The genetic control center of a eukaryotic cell.
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Nucleus. The membrane-bound region of a eukaryotic cell that contains the chromosomes.
O
Occupational Safety and Health Act. See Occupational Safety and Health Administration.
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nucleus
An organelle of eukaryotic cells that is bounded by a nuclear membrane and contains the chromosomes whose genes control the structure of proteins within the cell.
Covered in: Lab 3 Cell Biology
O ...
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Nucleus: The cellular organelle in eukaryotes that contains the genetic material.
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a Nucleus and its Nucleolus
In cell biology, the nucleolus (plural nucleoli) is a "suborganelle" of the cell nucleus, which is an organelle. A main function of the nucleolus is the production and assembly of ribosome components.
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pronucleus - haploid, gametic nucleus (from sperm or egg) in a fertilized egg, prior to fusion to form a zygote nucleus ...
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The nucleus of Killing Heidi is singer/songwriter Ella Hooper and her older brother guitarist Jessie Hooper.
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1. The nucleus of any cell.
2. A nucleus that has been excised from a cell.
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the lack of a nucleus;
the possession of a single double-stranded DNA molucule
the possession of a very small range of organelles ...
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Related Terms: Nucleus
The term introduced by Brown (1833) for the more or less spherical structure which occures in cells and stains deeply with basic dyes. The cellular organelle in eukaryotes that contains the genetic material.
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located in the nucleus and composed of DNA
Chromo-color, Somes-bodies: colored-bodies "managing Director"
Nuclear membrane ...
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Structure in a cell nucleus that carries the genes. Each chromosome consists of one very long strand of DNA, coiled and folded to produce a compact body. They become more compact and visible during metaphase of cell division.
I ...
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A single-celled, microscopic prokaryotic organism: a single cell organism without a distinct nucleus. Base pair (bp). A pair of complementary nitrogenous bases in a DNA molecule--adenine-thymine and guanine-cytosine.
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Chromosome -- in the eukaryotic nucleus, one of the threadlike structures consisting of chromatin and carry genetic information arranged in a linear sequence.
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cloning The production of large numbers of identical DNA molecules or cells (or organisms) from a single ancestral DNA molecule, nucleus or cell. closed system A system that exchanges neither matter nor energy with the surroundings.
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Centrioles - essential tubular organelles found near the nucleus in pairs that aid in cellular division
Chlorophyll - the green material found in chloroplasts that is active in photosynthesis ...
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In this technique, the nucleus of a recipient egg is removed to make way for the genetic material of the donor (Fig. 5). The donor cell is fused with the enucleated egg cell by subjecting the two cells to pulses of electricity.
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eukaryotic - cell has nucleus; divides through mitosis
The cytoplasmic membrane of prokaryotes is fundamentally similar to that of a eukaryotic cell.
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Chemical complexity is the amount of DNA in a haploid cell, nucleus or organelle. The chemical complexity of a unit's DNA is also called its genome size.
There are more different sequences in 3 pg animal nuclear DNA than in 0.004 pg of bacterial DNA.
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RNA SPLICING - A complex and incompletly understood series of reactions occuring in the nucleus of eukaryotic cells in which pre-mRNA transcribed from chromosomal DNA is processed such that noncoding regions of the pre-mRNA (introns) are excised, ...
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Primary transcript: When a gene is transcribed in the nucleus, the initial product is the primary transcript, an RNA containing copies of all exons and introns.
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Eukaryote organisms whose cells have a true nucleus
(eu = good well true; karyon = nut kernel nucleus)
Euryhaline having a wide range of salt concentration tolerance
(eury = broad wide; halin hali halo = salt the sea) ...
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4642. Principal sensory nucleus of the trigeminus
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4643. Principal sensory nucleus of trigeminal nerve ...
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Also, these chloroplasts contain what is called a nucleomorph, a DNA containing structure thought to be the vestige of a eukaryotic nucleus. (Prokaryotes and organelles don't have a membrane bound nucleus, their DNA just "floats free".) ...
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Microinjection
A method of introducing new DNA into a cell by injecting it directly into the nucleus.
Minimal essential pairing sequence (MEPS)
The shortest length of DNA homology required for the initiation of homologous recombination.
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Chromosomes
Structures in the cell nucleus, each containing the DNA for many hundred genes, packaged with proteins.
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A variety of RNAs found in the nucleus, including primary transcripts.
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bacterium (plural: bacteria). A single-celled, microscopic, plantlike organism that lacks a nucleus. Most bacteria obtain their nitrogen and energy from organic matter; some bacteria cause plant or animal diseases.
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