Nucleolus

nucleolus
the somewhat spherical body within a nucleus; site of RNA synthesis
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...

Nucleolus
From Wikipedia, the free encyclopedia
Jump to: navigation, search ...

Nucleolus
In biology, the nucleolus is, strictly speaking, a "suborganelle" of the cell nucleus, which is an organelle.

Search for nucleolus in these other databases too
Definition of nucleolus : ...

Nucleolus
The nucleolus is a region found within the cell nucleus that is concerned with producing and assembling the cell's ribosomes.

The Nucleolus
The nucleolus is a prominent sub-nuclear structure that is not bound by a membrane and resides within the nuclear matrix.

nucleolus A round or oval body in the nucleus of a eukaryotic cell; consists of DNA and RNA and produces ribosomal RNA (pl.: nucleoli). PICTURE ...

nucleolus
(noo-klee-oh-lus) [L. a small kernel]
A specialized structure in the nucleus, formed from various chromosomes and active in the synthesis of ribosomes.
nucleoside ...

The Nucleolus
During the period between cell divisions, when the chromosomes are in their extended state, 1 or more of them (10 in human cells) have loops extending into a spherical mass called the nucleolus.

Nucleolus
The more or less spherical structure which occurs in association with a particular point (the nucleolar organizer) on a specific chromosome in the nucleus.

Nucleolus: The prominent structure in the nucleus is the nucleolus. The nucleolus produces ribosomes, which move out of the nucleus and take positions on the rough endoplasmic reticulum where they are critical in protein synthesis.

Nucleolus
- A nuclear organelle of eukaryotes, associated with the chromosomal site of genes coding for rRNA
Nucleosome ...

nucleolus - structure in the nucleus where ribosomal RNA is transcribed and ribosomal subunits are assembled
Okazaki fragments - short lengths of DNA produced on the lagging strand during DNA replication ...

nucleolus A deeply staining body within the nucleus of a cell and containing RNA; nucleoli are specialized portions of certain chromosomes that carry multiple copies of the information to synthesize ribosomal RNA.

The nucleolus disappears.
The nuclear membrane becomes fragmented and disappears by the end of prophase.

chloroplasts; b) cell membranes, cell walls; c) chloroplasts, nucleus; d) chloroplasts, cell wall
The ___ is the membrane enclosed structure in eukaryotic cells that contains the DNA of the cell. a) mitochondrion; b) chloroplast; c) nucleolus; d) ...

During prophase, the chromosomes begin to coil more tightly and, as a consequence of the coiling, the nucleolus disappears since it was composed of the elongated DNA coding for ribosomal RNA where rRNA was being transcribed on open DNA.

"The nuclear network of chromatin filaments assumes the form of a twisted skein or spirem, while the nuclear membrane and nucleolus disappear. The convoluted skein of chromatin divides into a definite number of V-shaped segments or chromosomes.

small nucleolar RNA Small nuclear RNAs (snoRNA) that are involved in the processing of pre-ribosomal RNA in the nucleolus.

The chromosomal region around which the nucleolus forms, a site of tandem repeats of the rRNA gene. A region (or regions) of the chromosome set physically associated with the nucleolus and containing rRNA genes.

Nucleus
Double membrane surrounding the chromosomes and the nucleolus. Pores allow specific communication with the cytoplasm. The nucleolus is a site for synthesis of RNA making up the ribosome.

The nucleoplasm is the suspension fluid that holds the cell's chromatin and nucleolus. It is not always present in the nucleus. When the cell divides, the nuclear membrane dissolves and the nucleoplasm is released.

It has three main components: the nucleolus, the chromatin and the nuclear envelope. The nuclear envelope has nuclear pores to control the movement of molecules between the nucleoplasm and the cytoplasm.

These substances are organized to constitute the living organelles, as endoplasmic reticulum, ribosomes, chloroplasts, mitochondria, Golgi apparatus, nucleolus, nucleus, lysosomes, vacuoles, and centrosomes.

Nucleolus - spherical structure within the nucleus that contains RNA
Nucleus - spherical organelle that is the cell's control center
Phagocyte - collective term for cells that engulf other cells or microorganisms ...

See also: Cell, Organ, Nucleus, Membrane, Cells