Eukaryotes

Gene Regulation in Eukaryotes
The latest estimates are that a human cell, a eukaryotic cell, contains 20,000-25,000 genes.
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Eukaryotes are organisms with complex cells, in which the genetic material is organized into membrane-bound nuclei.
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Eukaryotes have evolved much more complex transcriptional regulatory mechanisms than prokaryotes.
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eukaryotes: cells that contain a nucleus and internal cellular bodies called organelles.
evolution: changes that occur within populations and organisms that make individuals able to adapt to their external environment.
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Eukaryotes have 9 doublets (pairs) of microtubules arranged in a circle around 2 central microtubules. This 9 + 2 pattern is characteristic of all eukaryotic cilia and flagella but not those of prokaryotes.
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eukaryotes
Any member of a group of organisms that contains all plants and animals apart form bacteria and blue-green algae. Their cells possess a membrane-bound nucleus containing the genetic material.
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: In eukaryotes, it is an accidental
byproduct
of transcriptional process. It may occur as the genome of certain viruses (such as
reovirus
) or may be produced during viral replication as a general marker for viral infection. It is believed that ...
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1] In eukaryotes, the cap site is the position in the gene at which transcription starts, and really should be called the "transcription initiation site". The first nucleotide is transcribed from this site to start the nascent RNA chain.
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Cap: All eukaryotes have at the 5' end of their messages a structure called a "cap", consisting of a 7-methylguanosine in 5'-5' triphosphate linkage with the first nucleotide of the mRNA.
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intron In eukaryotes, bases of a gene transcribed but later excised from the mRNA prior to exporting from the nucleus and subsequent translation of the message into a polypeptide. PICTURE ...
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The membrane in eukaryotes that encloses the nucleus, separating it from the cytoplasm.
nucleic acid
(new-clay-ick) ...
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Chromosomes exist in pairs in higher eukaryotes. (See Chromosome walking.) Chromosome walking. Working from a flanking DNA marker, overlapping clones are successively identified that span a chromosomal region of interest. (See Chromosome.) Cistron.
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Codes for the first amino acid in all polypeptide sequences, which is N-formyl-methionine in prokaryotes and methionine in eukaryotes.
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Alternative splicing is an important regulatory mechanism in higher eukaryotes1. By recent estimates, at least 30% of human genes are spliced alternatively (Mironov, A.A. and Gelfand, M.S. Proc. 1st Int. Conf.
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Eukaryotes - advanced cell type with a nuclear membrane surrounding genetic material and numerous membrane-bound organelles dispersed in a complex cellular structure ...
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rDNA genes are tandemly repeated in eukaryotes. They differ from satellite DNAs in that the length of the repeat is longer and the DNA is not highly repeated.
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These are: the prokaryotes ("ordinary" bacteria), archaebacteria (thermophilic, methanogenic and halophilic bacteria) and eukaryotes.
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Recent evidence strongly suggests that lateral gene transfer involving eukaryotes may be more prevalent than once thought. In some DNA sequences, bacterial or archaeal sequences cluster in clades that are otherwise strictly eukaryotic.
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77-84 9 Nutrient-regulated gene expression in eukaryotes Richard J. Reece, Laila Beynon, Stacey Holden, Amanda D. Hughes, Karine RBora and Christopher A. Sellick..........
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Eukaryotic cells (or eukaryotes):
Organism whose cells have:
a distinct nucleus,
multiple chromosomes, and
a myotic cycle.
This classification includes animals, plants, and fungi.
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mitochondrion -- Complex organelle found in most eukaryotes; believed to be descended from free-living bacteria that established a symbiotic relationship with a primitive eukaryote.
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gonidia - reproductive cells of colonial eukaryotes such as Volvox.
goosecoid- a homeodomain transcription factor expressed in the dorsal lip of the blastopore; may be a key factor is specifying these cells as the organizer of the embryo.
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A short cylindrical organelle, found in pairs arranged at right angles to each other at the centre of a microtubule organizing centre (MTOC) or centrosome, found in eukaryotes (except in higher plants).
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Histone
A basic protein from eukaryotes (or Archae) which binds to DNA, forming nucleosomes, and packaging the DNA into chromatin.
Histone-like proteins
Proteins from bacteria which bind to DNA, and compact the DNA.
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As with eukaryotes, the membrane controls the permeability of the cell and is the major site of energy metabolism.
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Although the progenote hypothesis is discredited, molecular trees tend to group living things into the three domains, with the eukaryotes placed beside or within the Archaea and the eubacteria forming a separate branch.
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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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KingdomPlantae group of multicellular eukaryotes most of which have chlorophyll and do photosynthesis to make their own food
(planta = plant; probably from plantare = to level the ground for sowing; planus = level flat) ...
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Cell or organism with membrane-bound, structurally discrete nucleus and other well-developed subcellular compartments. Eukaryotes include all organisms except viruses, bacteria, and blue-green algae. Compare prokaryote. See chromosomes.
Gene mapping ...
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ocytes A group of prokaryotes currently classified among the Archaebacteria but possibly a sister group of eukaryotes.
eosinophil White blood cells characterized by the presence of cytoplasmic granules that become stained by an acid dye.
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a cell that lacks a membrane-bonded nucleus, does not undergo meiosis, and lacks the structurally complex chromosomes found in eukaryotes
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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In higher eukaryotes, the conversion of cultured cells to a malignant phenotype--typically through infection by a tumor virus or transfection with an oncogene. (See Transformant, Transformation efficiency.) ...
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A phylogenetic tree of all living things, based on rRNA gene data, showing the separation of the three domains bacteria, archaea, and eukaryotes as described initially by Carl Woese.
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