Ribosomes

Ribosomes
Ribosomes are the protein-synthesizing machines of the cell.
They translate the information encoded in messenger RNA (mRNA) into a polypeptide.

Ribosomes
All living cells contain ribosomes, tiny organelles composed of approximately 60 percent ribosomal RNA (rRNA) and 40 percent protein.

Ribosomes - Protein Construction Teams
Cells need to make proteins. Those proteins might be used as enzymes or as support for other cell functions. When you need to make proteins, you look for ribosomes.

Ribosomes (from ribonucleic acid and "greek: soma (meaning body)") are complexes of RNA and protein that are found in all cells.

Ribosomes (20-30nm)
Small organelles often attached to the ER but also found in the cytoplasm
Large (protein) and small (rRNA) subunits form the functional ribosome ...

ribosomes Small organelles made of rRNA and protein in the cytoplasm of prokaryotic and eukaryotic cells; aid in the production of proteins on the rough endoplasmic reticulum and ribosome complexes. The site of protein synthesis.

Ribosomes are the tiny structures where proteins synthesis occurs. They are not membrane-bound and occur in all cells, although there are differences between the size of subunits in eukaryotic and prokaryotic ribosomes.

Ribosomes
Ribosomes read the code in mRNA and synthesize protein accordingly.
The symbols to the left are used in the drawings of protein synthesis below.

Ribosomes
Small cellular components composed of specialized ribosomal RNA and protein; site of protein synthesis.
See also: RNA
Risk communication ...

Free ribosomes
Free ribosomes occur in all cells, and also in mitochondria and chloroplasts in eukaryotic cells. Several free ribosomes can associate on a single mRNA molecule to form a polyribosome or polysome.

Ribosomes of prokaryotes (e.g. bacteria) are smaller than most of the ribosomes of eukaryotes (e.g. plants and animals).

Ribosomes give the cytoplasm of bacteria a granular appearance in electron micrographs.

Ribosomes
Protein and RNA complex responsible for protein synthesis.
Smooth endoplasmic reticulum (SER)
A network of interconnected membranes forming channels within the cell. A site for synthesis and metabolism of lipids.

Ribosomes are a part of the protein-generating factory in the cell. The ribosome itself is a two-subunit structure that binds to messenger RNA.

ribosomes - particle composed of ribosomal RNAs and ribosomal proteins that associates with messenger RNA and catalyzes the synthesis of protein ...

23. Which of the following are found in ALL cells (both prokaryotic and eukaryotic)?
a. nuclei
b. mitochondria
c. ribosomes
d. cell walls
e. enzymes
24. Enzymes are
a. catalysts
b. proteins ...

An antibiotic of the aminoglycoside family that poisons translation by binding to the ribosomes. See Kanamycin. kanr. Kanamycin resistance gene. (See Selectable marker.) Karyotype.

They have their own DNA (ctDNA) and ribosomes and are maternally inherited.
Related Terms:
Plastid
A cell-body (organellae) in plants other than nucleus, mitochondria and centrosome.

The matrix of a cell that contains the ribosomes, the cytoskeleton and different aggregates of storage compounds. Nucleus, cytoplasm, plastids, mitochondria and membrane form the cell.
Related Terms:
Ribosome ...

In prokaryotes (bacteria and other simple organisms) as well as the more complex eukaryotes, ribosomes help translate gene-encoded information into a specific protein. Ribosomes consist of two unequally sized subunits containing RNA and proteins.

Ribosomal RNA (rRNA) A class of RNA found in the ribosomes of cells.
Ribosomes Small cellular components composed of specialised ribosomal RNA and protein; site of protein synthesis. See ribonucleic acid (RNA).

Through the work of Carl Woese who had been doing a lot of work on ribosomes and understood these basic evolutionary mechanisms of protein synthesis. Why [did] he chose this specific gene?

RIBOSOME - A complex ribonucleoprotein particle (eukaryotic ribosomes contain 4 RNAs and at least 82 proteins) which is the "machine" which translates mRNA into protein molecules.

Initiation factors
Proteins that promote the binding of ribosomes and the initiator tRNA to mRNA to begin the process of translation.
Inoculum
The initial sample of a microorganism added to a medium used to start a new culture.

This process requires ribosomes (which are composed of rRNA along with various proteins) to perform the synthesis, and tRNA to bring in the amino acids.

That portion of the endoplasmic reticulum that is free of ribosomes.
smooth muscle
A type of muscle lacking the striations of skeletal and cardiac muscle because of the uniform distribution of myosin filaments in the cell.

Ribosomal RNA (rRNA): A class of RNA found in the ribosomes of cells.
Ribosome : The small cellular structure in which RNA translates the genetic code into proteins.
RNA: See Ribonucleic acid.

polysome Two or more ribosomes connected by a molecule of messenger RNA.
polytene chromosomes Chromosomes in the somatic cells of some insects in which the chromatin replicates repeatedly without undergoing mitosis.

Endoplasmic reticulum (ER) An extensive system of cytoplasmic membranes that comprises about half the total cell membrane. The region of the ER that binds ribosomes is called the rough ER, ...

RNA molecules which bond with amino acids and transfer them to ribosomes, where protein synthesis is completed.
Source : PhRMA Genomics
Transgenic ...

a species of RNA molecule that plays a poorly understood role in the structure and function of ribosomes
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
...

An RNA molecule transcribed from the DNA of a gene, and from which a protein is translated by the action of ribosomes. The basic function of the nucleotide sequence of mRNA is to determine the amino acid sequence in proteins.

Downstream: The direction which RNA polymerase moves during transcription (5' to 3') and ribosomes moves during translation.

A complex organelle (composed of proteins plus rRNA) that catalyzes translation of messenger RNA into an amino acid sequence. Ribosomes are made up of two non-identical subunits each consisting of a different rRNA and a different set of proteins.

Ribosome (RYE-bo-sohm) A molecular complex in which proteins are made. In eukaryotic cells, ribosomes either are free in the cytoplasm or are attached to the rough endoplasmic reticulum.

The components of a typical prokaryotic cell are a cell wall, a cytoplasmic membrane, a single molecule of DNA, ribosomes and the cytoplasm. All other components, although they might be present, are essentially dispensable.

Translation. The process of converting the genetic infor- mation of an mRNA on ribosomes into a polypeptide. Transfer RNA molecules carry the appropriate amino acids to the ribosome, where they are joined by peptide bonds.

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

Messenger RNA is then translated via cellular machinery called ribosomes into a string of amino acids -- a protein. Some proteins function as enzymes, catalysts that speed the chemical reactions in cells.

by the possession of a simple naked DNA chromosome, occasionally two such chromosomes, usually of circular structure, without a nuclear membrane and possessing a very small range of organelles, generally only a plasma membrane and ribosomes.

Ribosomes - extremely small grain-like organelle that provides the sites for protein synthesis (they may be free in the cytoplasm or attached to the endoplasmic reticulum) ...

See also: Ribosome, Protein, Proteins, Trans, Cell