Polyp

Polypeptides are chains of amino acids. Proteins are made up of one or more polypeptide molecules.
The amino acids are linked covalently by peptide bonds. The image shows how three amino acids linked by peptide bonds into a tripeptide.
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polyploidy
the condition in which the number of chromosome sets in an individual or cell is three or more times the haploid set; 3n, 4n, etc.
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Polyploidy is the condition of cells or organisms that contain more than two copies of each of their chromosomes. Where an organism is normally diploid, some spontaneous aberrations may occur which are usually caused by a hampered cell division.
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Chapter 7
Plant polyphenols: free radical scavengers or chain-breaking antioxidants?
Catherine Rice-Evans
Free Radical Research Group, Division of Biochemistry and Molecular Biology, UMDS-Guy's Hospital, St. Thomas Street, London SE1 9RT, U.K.
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Polyploidy is the state where all cells have multiple pairs of chromosomes beyond the basic set. Polyploidy is common in plants, and rare in animals.
Categories: Classical genetics
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Polyploidy is a major evolutionary mechanism in plants. Approximately 47% of all flowering plants are polyploid.
Some examples of polyploid plant species are corn, wheat, cotton, sugarcane, apples, bananas, watermelons, and many flowers.
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Polyploidy in which all the chromosomes come from the same species; the polyploid is formed by the doubling of a single genome.
Related Terms: Polyploid ...
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Polyphyletic taxa are considered "unnatural", and usually are reclassified once they are discovered to be polyphyletic.
Examples : marine mammals, bipedal mammals, flying vertebrates, trees, algae, etc.
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polyploid produced by the hybridization of two species. See amphidiploid.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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Polyp. An individual of a solitary coelenterate or one member of a coelenterate colony
Polyphyletic. Refers to a group of species that do not have one common ancestor species
Population density. Number of individuals per unit area or volume ...
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Polypeptide A protein or part of a protein made of a chain of amino acids joined by a peptide bond.
Population genetics The study of variation in genes among a group of individuals.
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Polypeptide: A molecule made up of a stri ng of amino acids. A protein is an example of a polypeptide.
Proteins: The active molecules in all cells. Proteins control biochemical reactions and determine the physical structure of organisms.
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polyphyletic
Pertaining to a taxon whose members were derived from two or more ancestral forms not common to all members.
polyploid ...
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polyploidy Abnormal variation in the number of chromosome sets. The condition when a cell or organism has more than the customary two sets of chromosomes.
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POLYPEPTIDE - See PEPTIDE.
pre-mRNA - An RNA molecule which is transcribed from chromosomal DNA in the nucleus of eukaryotic cells, ...
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Polypeptide (protein). A polymer composed of multiple amino acid units linked by peptide bonds.
Polyploid. A multiple of the haploid chromosome number that results from chromosome replication without nuclear division.
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polyp Individual of the phylum Cnidaria, generally adapted for attachment to the substratum at the aboral end, often form colonies.
polypeptide A molecule consisting of many joined amino acids, not as complex as a protein.
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polyp
The asexual reproducing, normally sedentary form of coelenterates such as the sea anemone.
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Polypeptide: See Peptide.
Polyprotein: A giant polypeptide that contains multiple individual protein sequences embedded within it and which must be proteolytically cleaved to yield the individual proteins.
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Polypeptide a chain of amino acids bonded together
(poly = many; pepti = digested cooked)
Polypetalous term used to refer to a plant with un-united flower parts attached to the receptacle
(poly = many; petal = a leaf spread out flat) ...
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A polypeptide secreted by bacteria which inhibit or prevent the growth of related bacteria which lack the corresponding colicin immunity proteins. Colicins are encoded by a group of naturally occurring plasmids first found in E. coli (e.g.
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Some intein polypeptides are site-specific endonucleases as well as protein splicing catalysts. Endonuclease action results in insertion of the intein nucleic acid in a target site.
Facts ...
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A DNA sequence that codes for a specific polypeptide; a gene. See DNA, Gene. Clone. An exact genetic replica of a specific gene or an entire organism. See Cloning. Cloning.
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pleated sheet The side-by-side, hydrogen-bonded arrangement of polypeptide chains in the extended conformation. pleo- more than usual polar Molecules which contain elements differing in electronegativity, making them soluble in water.
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N- or C-terminal The amino acids which form polypeptides are joined by peptide bonds between the amino group of one amino acid and the carboxy group of the next.
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While determining the polypeptide sequence resulting from gene translation is straightforward, determining the actual three-dimensional (3D) structure requires some sophisticated experimental techniques.
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Speciation through hybridization and/or polyploidy has long been considered much less important in animals than in plants [[[refs.]]]. A number of reviews suggest that this view may be mistaken.
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The polypeptide is ultimately folded into a 3-dimensional protein structure, which will go on to perform some specific function in the cell such as an enzyme subunit or cell membrane component.
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Amino acids bind by forming a peptide bond.
Linear polymers of amino acids are called polypeptides.
Large polypeptides are called proteins.
A restricted set of 20 amino acids constitute the universal building blocks of proteins.
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(a small protein having two polypeptide chains) and immunoglobulin molecules, for example, have
interchain
and
intrachain
disulfide bonds. Endothelin and HLA molecules also have disulfide bonds.
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translation - process whereby mRNA code is used by the ribosome to synthesize a polypeptide chain (protein) from amino acid precursors.
transposable element - see transposon ...
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disulfide bond - covalent intrachain bonds found in protein molecules; covalent linking of two -SH groups of neighboring cysteine residues in a folded polypeptide chain. These bonds are rarely, if ever found in the cytosol.
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