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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 ...

Large structure in the nucleus of eukaryotic cells where rRNA synthesis and processing occurs and ribosome subunits are assembled.

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The nucleolus is a region found within the cell nucleus that is concerned with producing and assembling the cell's ribosomes. Following assembly, ribosomes are transported to the cell cytoplasm where they serve as the sites for protein synthesis.
Narration Transcription ...

The Nucleolus
The nucleolus is a prominent sub-nuclear structure that is not bound by a membrane and resides within the nuclear matrix. Though known to exist since the eighteenth century, the primary function of the nucleolus was not discovered until the 1960s.

The inactivated X chromosome becomes heterochromatic and visits a specific nuclear compartment adjacent to the nucleolus. Results Here, we show a novel role for the lncRNA Firre in anchoring the inactive mouse X chromosome and preserving one of its main epigenetic features, H3K27me3.

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
nucleosomes Spherical bodies formed by coils of chromatin. The nucleosomes in turn are coiled to form the ?bers that make up the chromosomes.

(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 ...

nucleolus /N(Y)OO-klee-OH-ləss/ A round body associated with a nucleolus organizing region. It is composed of the primary products of the rRNA genes, as well as their proteins and enzymes.
nucleolus organizing region (NOR) A chromosomal region containing ribosomal RNA (rRNA) genes.

nucleolus (plural, nucleoli)
A specialized structure in the nucleus, formed from various chromosomes and active in the synthesis of ribosomes.
Covered in BIOL1020 Lab 3 Cells ...

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.

The more or less spherical structure which occurs in association with a particular point (the nucleolar organizer) on a specific chromosome in the nucleus. At nuclear divisions, the nucleoli disappear in late prophase, are absent at metaphase and anaphase, and reappear during telophase.

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.

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

Nucleolus is a region within the nucleus made of ribosomal RNA (rRNA) and proteins. It is not delimited by membrane.
19. What is the name of the membrane that delimits the nucleus? To which component of the cell structure is that membrane contiguous?

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.

Nucleolus part of the nucleus of a cell where ribosomal RNA is produced
Nucleotide the basic unit from which nucleic acids are formed
Nucleus a large organelle found in eukaryotic cells ...

In the nucleolus, ribosomal RNA (rRNA) is synthesized and assembled with proteins from the cytoplasm to form ribosomal subunits.
The subunits pass through the nuclear pores to the cytoplasm, where they combine to form ribosomes.

9. nucleus (nuclear membrane would also be OK)
10. centrioles
11. plasma membrane
12. cytoplasm NOTES & TIPS :
#1 - generally, lysosomes are illustrated as "shaded-in" circles or ovals.
#2 - channels running through the cytoplasm ...

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.

Nucleus - the nucleus is where DNA is stored and where RNA transcription occurs. Each cell has one nucleus. Within the nucleus is a structure called the nucleolus which is the site of ribosome assembly.

Some of the unicellular protozoa contain no nuclei but granular particles which, like true nuclei, stain with basic dyes. The other constituents of the ovum, viz., its limiting membrane and the denser spot contained in the nucleus, called the nucleolus, are not essential to the type cell, ...

We used MIMS to study the distribution of RNA in the nucleolus by studying fibroblasts cultured in the presence of 15 N-uridine. Quantitative mass images of 12C-, 12C14N- and 12C15N- secondary ions were acquired in parallel.

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.

We know now that’s because right there in the nucleolus which means little center of the center thing we have not just DNA but we also have another kind of nuclear gas it called ribosomal RNA and so because that ribosomal RNA is being made right here in the nucleolus, ...

small nucleolar RNA Small nuclear RNAs (snoRNA) that are involved in the processing of pre-ribosomal RNA in the nucleolus. Box C/D containing snoRNAs (U14, U15, U16, U20, U21 and U24-U63) direct site-specific methylation of various ribose moieties.

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.

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.

Another structure within the nucleus is the nucleolus. The RNA, which will be made into ribosomes, is synthesised in the nucleolus.
Other organelles ...

chromatin and chromosomes
genetic information storage system
synthesis of ribosomes ...

The stable RNA component (numbering 75-100) of ribonucleoproteins that are located in the nucleolus and are typically involved in nucleotide modification or rRNA, cleavage of precursor rRNA, rRNA folding and assembly of ribosomal subunits.

nucleoli the small organelles that make up the nucleus; the site for ribosomal synthesis, assembly, and packaging (singular, nucleolus).
nucleotide the unit that makes up nucleic acid; contains a nitrogen base, a phosphate group, and a carbohydrate molecule.

Nuclear matrix - protein-containing fibrilar network
Nucleoplasm - the fluid substance in which the solutes of the nucleus are dissolved
Chromosomes - protein and DNA complexes
Nucleolus - involved in the synthesis and assembly of ribosomes ...

Its major functions are to maintain the integrity of DNA and to control cellular activities such as metabolism, growth, and reproduction by regulating gene expression. It has three main components: the nucleolus, the chromatin and the nuclear envelope.

Cytoplasm is a complex of organic and inorganic substances, mainly proteins, lipids, carbohydrates, minerals and water. These substances are organized to constitute the living organelles, as endoplasmic reticulum, ribosomes, chloroplasts, mitochondria, Golgi apparatus, nucleolus, nucleus, lysosomes, ...

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

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