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Topic: Prokaryote


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In the News (Tue 23 Apr 19)

  
  Welcome to the Miniature World of the Prokaryotes
Prokaryotes are the original inhabitants of this planet, the first successful living organisms may have looked very like some of today's Archaea.
Prokaryotes are single celled organisms that do not have a nucleus, mitochondria or any other membrane bound organelles.
The Archaea The Bacteria Prokaryotes in the News.
www.earthlife.net /prokaryotes/welcome.html   (0 words)

  
  Prokaryote Summary
Prokaryote is a kingdom, or division, in the classification scheme devised for all life on Earth.
Prokaryotes are cells or organisms that lack a nuclear membrane and membrane bound organelles.
Prokaryotic cells are characteristic of a metabolically diverse assortment of bacterial organisms grouped together in the kingdom Monera.
www.bookrags.com /Prokaryote   (286 words)

  
  Prokaryote - Wikipedia, the free encyclopedia
Prokaryotes also were previously considered to lack cytoskeletons and do lack membrane-bound cell compartments such as vacuoles, endoplasmic reticula, mitochondria and chloroplasts.
Prokaryotes have a single circular (only exceptionally linear, as in Borrelia burgdorferi or the Streptomyces) chromosome, contained within a region called nucleoid, rather than in a membrane-bound nucleus, but may also have various small circular pieces of DNA called plasmids spread throughout the cell.
The prokaryotes are different to the eukaryote other than in the membrane bound organelles in that the DNA in the eukaryote is found in the nucleus while in the prokaryote there is only a single loop of DNA.
en.wikipedia.org /wiki/Prokaryote   (803 words)

  
 Prokaryote
prokaryotische cel (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), prokaryote cel (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), prokaryoot (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), prokaryont (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), procaryoot (procaryote, prokaryotic).
Protokaryota (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), prokaryotische Zelle (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), Prokaryote (procaryote), Prokaryot-Bakterie, Prokaryota (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), Prokaryonte (procaryote), Prokaryont (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote).
protocariote (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), procariote (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), procariota (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), célula procariota (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), célula procariótica (procaryote, procaryotic, procaryotic cell, prokaryotic, prokaryotic cell, protocaryote), bactéria procariota.
www.websters-online-dictionary.org /definition/english/pr/prokaryote.html   (657 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
A major distinction between prokaryotes and eukaryotes (meaning true kernel, also spelled "eucaryotes") is that eukaryotes have "true" nuclei containing their DNA, whereas the genetic material in prokaryotes is not membrane-bound.
Prokaryotes also were previously considered to lack cytoskeletons and do lack membrane-bound cell compartments such as vacuoles, endoplasmic reticulum/endoplasmic reticula, Golgi apparatus, mitochondria, and chloroplasts.
Prokaryote genes are also expressed in groups, known as operons, instead of individually, as in eukaryotes.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Prokaryote   (1145 words)

  
 Prokaryote
Prokaryotes are mostly unicellular organisms without a nucleus, in contrast to eukaryotes, organisms that have cell nuclei and may be variously unicellular or multicellular.
Prokaryotes are capable of inhabiting almost every place on the earth, from the deep ocean, to the edges of hot springs, to just about every surface of the human body.
It is generally accepted that the first living cells were some form of prokaryote, and they are known as fossils from over 3.5 billion years ago.
www.xasa.com /wiki/en/wikipedia/p/pr/prokaryote.html   (417 words)

  
 Online Encyclopedia and Dictionary - Prokaryote
Prokaryotes are unicellular (in rare cases, multicellular) organisms without a nucleus.
Prokaryotes also lack cytoskeletons and membrane-bound cell compartments such as vacuoles, endoplasmic reticulum, mitochondria and chloroplasts.
Prokaryotes have a single haploid circular (only exceptionally linear, as in Borrelia burgdorferi) chromosome, contained within a region called nucleoid, rather than in a membrane-bound nucleus, but may also have various small circular pieces of DNA called plasmids spread throughout the cell.
fact-archive.com /encyclopedia/Prokaryote   (596 words)

  
 ScienceDaily: Prokaryote
Prokaryotes are organisms without a cell nucleus, or indeed any other membrane-bound organelles, in most cases unicellular (in rare cases, multicellular).
This set of characteristics is distinct from eukaryotes (also spelled "eucaryotes"), organisms that have cell nuclei and may be variously unicellular or multicellular.
Prokaryote -- Prokaryotes are organisms without a cell nucleus, or indeed any other membrane-bound organelles, in most cases unicellular (in rare cases, multicellular).
www.sciencedaily.com /encyclopedia/Prokaryote   (1376 words)

  
 Highbeam Encyclopedia - Search Results for Prokaryote
prokaryote A single-celled organism in which the cell lacks a true nucleus and the DNA is present as a loop in the cytoplasm rather than as chromosomes bounded by a nuclear membrane.
The prokaryotes comprise the bacteria, which appear in the fossil record more than 3000 Ma ago and are the oldest...
Genetic regulatory system of single-celled organisms (prokaryote s) and their viruses, in which gene s coding for functionally related proteins are clustered along the DNA, enabling their expression to be coordinated in response to the cell's needs.
www.encyclopedia.com /SearchResults.aspx?Q=Prokaryote   (0 words)

  
 BioMed Central | Full text | A genomic timescale of prokaryote evolution: insights into the origin of methanogenesis, ...
The timescale of prokaryote evolution has been difficult to reconstruct because of a limited fossil record and complexities associated with molecular clocks and deep divergences.
Moreover the increasing number of prokaryotic genomes available has facilitated the detection of HGT through more accurate detection of orthology, paralogy, and monophyletic groups, and the concatenation of gene and protein sequences has helped increase the confidence of nodes and decrease the variance of time estimates [14,16,18,19].
Other studies that have analyzed prokaryote genome sequence data for phylogeny have found a similar high proportion of proteins in the "information storage and processes" functional category, presumably because HGT is more difficult with such genes that are vital for the survival of the cell [3,18,33,34].
www.biomedcentral.com /1471-2148/4/44   (0 words)

  
 What Is Prokaryote?
Prokaryotes are mostly unicellular organisms without a nucleus, in contrast to eukaryotes, organisms that have cell nuclei and may be variously unicellular or multicellular.
Prokaryotes are the largest group of organisms, mostly due to the vast array of bacteria which comprise the bulk of the prokaryote classification.
Prokaryotes are also ecologically important as photosynthetic or chemosynthetic producers, as decomposers, and as participants in the global cycling of nutrients such as carbon, nitrogen, and sulfur.
www.bionewsonline.com /6/what_is_prokaryote.htm   (18672 words)

  
 Prokaryotes   (Site not responding. Last check: )
Prokaryotes are single-celled organisms distinguished from single- and multi-celled eukaryotes by a number of features.
Prokaryotes are the only group where all of the four modes of nutrition (means of obtaining energy and carbon) are found among the different kinds.
Prokaryotes are also ecologically important as photosynthetic or chemosynthetic producers, as decomposers, and as participants in the global cycling of nutrients such as carbon, nitrogen, and sulfur.
web.bio.utk.edu /guffey/Biodiversitysite/Prokaryotes/Prokaryotes.html   (675 words)

  
 prokaryote
Bacteria are the best known and most studied form of prokaryotic organisms, although the discovery of a second group of prokaryotes, called archaea, has provided evidence of a third cellular domain of life and new insights into the origin of life itself.
Prokaryotes are unicellular organisms that don't develop or differentiate into multicellular forms.
Prokaryotes are capable of inhabiting almost every place on the Earth, from the deep ocean, to the edges of hot springs, to just about every surface of our bodies.
www.daviddarling.info /encyclopedia/P/prokaryote.html   (205 words)

  
 Prokaryote definition - Medical Dictionary definitions of popular medical terms
Bacteria are the best known and most studied form of prokaryotic organisms, although the recent discovery of a second group of prokaryotes, called archaea, has provided evidence of a third cellular domain of life and new insights into the origin of life itself.
Prokaryotes are distinguished from eukaryote on the basis of nuclear organization, specifically their lack of a nuclear membrane.
Prokaryotic cells have three architectural regions: appendages called flagella and pili--proteins attached to the cell surface; a cell envelope consisting of a capsule, a cell wall, and a plasma membrane; and a cytoplasmic region that contains the cell genome (DNA) and ribosome and various sorts of inclusions.
www.medterms.com /script/main/art.asp?articlekey=5062   (354 words)

  
 Prokaryotes - Hotuwiki
Prokaryotes are very small cells that have no membrane around their nucleus nor any organelles.
At the center of the prokaryote is the nuclear region, but not separated from the rest of the cell by a membrane.
At one end of the prokaryote there may be a wonderful little motor with a long stiff strand attached to it on the outside of the cell.
www.historyoftheuniverse.com /hotuwiki/index.php?title=Prokaryotes&printable=yes   (319 words)

  
 Prokaryotes   (Site not responding. Last check: )
Prokaryotes are the single-celled organisms, such as bacteria, and are roughly one micrometer in diameter.
One differentiating characteristic is that prokaryotes are asexual, meaning their offspring nearly always bear the exact characterisitcs of the parent cell.
Prokaryotic cells and fossils have have been found in almost every conceivable environment on the earth, from hot sulfur springs to beneath the ocean floor and within larger cells.
www.gpc.edu /~pgore/students/w96/joshbond/prok.htm   (221 words)

  
 prokaryote - What is definition of the term - prokaryote ?   (Site not responding. Last check: )
Prokaryotes also were previously considered to lack cytoskeletons and do lack membrane-bound cell compartments such as vacuoles, endoplasmic reticulum, mitochondria and chloroplasts.
Prokaryotic cell walls are composed of peptidoglycan, a combination of protein and sugar.
The prokaryotes is different to the eukaryote other than in the membrane bound organelles in that the DNA in the eukaryote is found in the nucleus while in the prokaryote there is only a single loop of DNA.
www.linguasphere.org /dictionary/n-57835-prokaryote.html   (699 words)

  
 Evolution - A-Z - Prokaryote   (Site not responding. Last check: )
The genome of a prokaryote is in the form of a single DNA molecule, like a single chromosome.
Prokaryotes are first found in the fossil record 3,500 million years ago, and are the earliest type of organism.
Figure: prokaryotes are simple organisms without a distinct nucleus: the DNA lies naked within the cell.
www.blackwellpublishing.com /ridley/a-z/Prokaryote.asp   (81 words)

  
 Wikinfo | Prokaryote   (Site not responding. Last check: )
Prokaryotes are single-celled organisms without a nucleus; i.e.
Prokaryotic life is ubiquitous on Earth, present in every concievable biome (and also being found in places where no life of any kind had been expected to exist, for example the endolithic biome).
It is thought that the first living cells on Earth were likely prokaryotic in structure, and possibly similar to some existing archaea.
www.wikinfo.org /wiki.php?title=Prokaryote   (227 words)

  
 Cell Theory, Form, and Function—Prokaryotes and Eukaryotes
Prokaryote cells are the simplest type and are evolutionary precursors to eukaryote cell types.
In contrast to prokaryotes, in eukaryotes the chromosomes are made of distinct lengths of DNA and are stored within a nuclear membrane.
Because prokaryotes are simpler, lacking membrane-bound organelles, they are also much smaller (1 to 10 micrometers) than eukaryotes, which range from 10 to 100 micrometers in size.
www.factmonster.com /cig/biology/prokaryotes-eukaryotes.html   (278 words)

  
 Prokaryotes, Eukaryotes, & Viruses Tutorial
Prokaryotic cells lack characteristic eukaryotic subcellular membrane enclosed "organelles," but may contain membrane systems inside a cell wall.
Prokaryotic cells may have photosynthetic pigments, such as is found in cyanobacteria ("blue bacteria").
Prokaryotic cells come in multiple shapes: cocci (round), baccilli (rods), and spirilla or spirochetes (helical cells).
www.biology.arizona.edu /cell_bio/tutorials/pev/page2.html   (516 words)

  
 Prokaryotic Cells
Cells that lack a membrane-bound nucleus are called prokaryotes (from the Greek meaning before nuclei).
Cells in the monera kingdom such as bacteria and cyanobacteria (also known as blue-green algae) are prokaryotes.
Unlike eukaryotic cells that depend on oxygen for their metabolism, prokaryotic cells enjoy a diverse array of metabolic functions.
library.thinkquest.org /C004535/prokaryotic_cells.html   (190 words)

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