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Topic: Unicellular organisms


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  Microorganism
Microorganisms are often described as single-celled, or unicellular organisms; however, some unicellular protists are visible to the naked eye, and some multicellular species are microscopic.
Unicellular species are those whose members consist of a single cell throughout their life cycle.
Unicellular organisms usually contain only a single copy of their genome when not undergoing cell division, although some organisms have multiple cell nuclei (see coenocyte).
articles.gourt.com /en/microorganism   (541 words)

  
  Invasion of the Coastal Environment & Origin of Multicellurity   (Site not responding. Last check: )
Organisms living in the highest intertidal zone are exposed to air longer and innudated more briefly than those living in the lowest intertidal zone, and so the intertidal zone itself represents a number of horizontal life zones.
Unicellular organisms are both cellular in function in having an interaction between the nucleus and cytoplasm, and organisms, "by virtue of molecular gradients and structural polarity" thus existing at two different levels of the molecular to ecosystem hierarchy (Korn, 1999).
Unicellular organisms with a regular cell form, i.e., non-amoeboid cells, tend to have a very specific and regular plane of division usually either parallel to or perpendicular to a long axis if one exists.
www.bio.ilstu.edu /armstrong/syllabi/222book/chapt4.htm   (17259 words)

  
 multicellular organism   (Site not responding. Last check: )
The development of multicellular organisms is accompanied by cellular specialization and division of labour; cells become efficient in one process and are dependent upon other cells for the necessities of life.
Specialization in single-celled organisms exists at the subcellular level; i.e., the basic functions that are divided among the cells, tissues, and organs of the multicellular organism are collected within one cell.
Unicellular organisms are sometimes grouped together and classified as the kingdom Protista.
www.santafe.edu /~dirk/welcome/multicell.html   (88 words)

  
 BioEd Online Slides: Monera, decomposers, unicellular, protist, mutualism: Biology Lesson Plan
Organisms are divided into each of five kingdoms based on defining characteristics, such as: cell type; cell structures; whether the organism is unicellular, multicellular, or has both forms; and nutrition.
Bacteria are unicellular organisms that do not contain a nucleus or internal compartments, and their genome does not contain introns.
Lichens are symbionts of a fungus and a green algae, or a cyanobacterium.
www.bioedonline.org /slides/slide01.cfm?tk=2   (1752 words)

  
 Cells the Fundamental Unit of Life
The life of the organism is dependant on the correct working of all the different groups, each of which is dependant on all the others for its continued existence.
In simple multicellular organisms such as sponges all the cells are very similar, in more complicated multicellular organisms the degree of specialisation of cells is much greater resulting in cells that are very different from one another.
In multicellular organisms the cells are specialised to perform particular jobs such as storage, support, growth, transport of resources or defence of the organism.
www.earthlife.net /cells.html   (1453 words)

  
 Rediscovering Biology - Online Textbook: Unit 3 Evolution and Phylogenetics
Although early natural historians did not recognize that the similarities and differences among organisms were consequences of evolutionary mechanisms, they still sought a means to organize biological diversity.
Unicellular organisms use a variety of modes of nutrition.
Microbial biologists became aware of these limitations as they discovered unicellular organisms that appeared to be prokaryotic, but were extremely distinct in ultrastructure and other characteristics from the traditional bacteria.
www.learner.org /channel/courses/biology/textbook/compev/compev_2.html   (668 words)

  
 Classification of Living Organisms
The number of living organisms is so staggering, that one must categorize them to make any sense of their relationship to one another.
Unicellular organisms have been classified by their microscopic structure and their biochemical processes (metabolism and chemical reactions).
For practical reasons, the names of unicellular organisms, are not based on their phylogenetic relationship, but on their means of identification in the laboratory, their pathogenicity (capacity to cause disease), their use for humans, etc..
www.zoonotics.net /classification_organisms.htm   (592 words)

  
 Microorganism - Wikipedia, the free encyclopedia
Archaea are single-celled organisms lacking nuclei and are therefore prokaryotes, classified as Monera in the alternative five-kingdom taxonomy.
Unicellular eukaryotes are those whose members consist of a single cell throughout their life cycle.
The organisms involved include bacteria, causing diseases such as plague, tuberculosis and anthrax: protozoa, causing diseases such as malaria, sleeping sickness and toxoplasmosis; and also fungi causing diseases such as ringworm, candidiasis or histoplasmosis.
en.wikipedia.org /wiki/Unicellular   (2295 words)

  
 Bacteriophage Ecology Group - Mission Statement
This is especially so since unicellular organisms, and their parasites are (as a group) more amenable to whole organismal and populational laboratory-manipulations than are multicellular organisms.
Since unicellular organisms greatly outnumber multicellular organisms, an understanding of the ecology of the parasites of unicellular organisms is relevant to gaining a complete understanding of our planet's ecology.
Unicellular organisms can serve as hosts for parasites also capable of infecting and causing disease in multicellular organisms.
www.mansfield.ohio-state.edu /~sabedon/beg_mission_statement.htm   (1224 words)

  
 Introduction to the Microbial World
Microorganisms are unicellular organisms (or are at least capable of existence as single cells), too small to be seen with the naked eye.
Although most microorganisms are unicellular and do not differentiate or develop into multicellular forms composed of different types of cells, there are many exceptions, so that this criterion cannot be used alone to differentiate a microorganism from a macroorganism.
Unicellular algae and protozoa (collectively referred to as protista) and fungi are eucaryotic cells, similar to plants and animals.
www.bact.wisc.edu /themicrobialworld/intro.html   (2775 words)

  
 Mono-cell Organisms
The advent of organic chemistry is often associated with the discovery in 1828 by the German chemist Friedrich Wöhler that the inorganic, or mineral, substance called ammonium cyanate could be converted in the laboratory to urea, an organic substance found in the urine of many animals.
Although both multicellular and unicellular organisms perform the same basic functions of life, since unicellular organisms do not possess organs; it requires different methods to absorb nutrition, to excrete waste, to grow, and to reproduce.
Some advanced eukaryotic unicellular organisms such as the algae has evolved to exhibit life cycles with diplontic period - that means they have sophisticated sex (exchange of genetic materials) to fertilize a zygote.
universe-review.ca /F11-monocell.htm   (16152 words)

  
 Taxonomy Quiz
Unicellular organisms with the nuclei NOT in a distinct nuclear membrane.
Unicellular organisms with the nucleus in a distinct nuclear membrane.
A is an organism and B is a tissue.
www.ekcsk12.org /science/regbio/taxonomyqz.html   (427 words)

  
 [No title]   (Site not responding. Last check: )
They are all unicellular organisms that live in watery conditions.
This phylum holds organisms that are almost like plants, but still have a few major diferences.
The amoeba is a group of unicellular organisms that range in size from.25 to 2.5mm.
www.angelfire.com /ks3/tswanson/Protista.html   (147 words)

  
 chapter 1 worksheet bI
Most unicellular organisms can only be seen with a __________________________.
Organisms that survive and reproduce are ones with ________________ traits.
The energy from metabolism is used for ___________, ___________, and _______________ of organisms.
sps.k12.ar.us /massengale/chapter_1_worksheet_bi.htm   (810 words)

  
 Microbes - Microorganisms - Crystalinks   (Site not responding. Last check: )
A microorganism or microbe is an organism that is microscopic (too small to be visible to the naked eye).
Unicellular organisms carry out all the functions of life.
Unicellular organisms usually contain only a single copy of their genome when not undergoing cell division, although some organisms have multiple cell nuclei.
www.crystalinks.com /microbes.html   (389 words)

  
 unicellular
Descriptive of tissues, organs, or organisms that consist of a single cell.
Unicellular organisms include bacteria, archaea, protists, and certain algae and fungi.
Certain algae and fungi that are multicellular have unicellular reproductive organs.
www.daviddarling.info /encyclopedia/U/unicellular.html   (104 words)

  
 X LI752I3/MIC
There are many kinds of organisms which cannot be seen without the use of a microscope Theses are very simple unicellular organisms These organisms have plant and animal characteristics, but they are not classified as plants or animals.
All the organisms in the kingdom Monera are unicellular organisms having a cell all, but not having a true nucleus.
These organisms are like other algae because they contain chlorophyll and can make their own food, but are different in that they can move.
www.utm.edu /departments/ed/cece/x/xli752i3.htm   (3827 words)

  
 Fungal Glossary
Air Sample (culturable) - A culturable air sample identifies the types of organisms present in the air that are alive, capable of growing on the agar used, and capable of competing with the other types of fungi present.
The nutrient media is incubated for a period of time during which the organisms mature and then can be identified and enumerated by the laboratory.
Lichen - A duel organism composed of a fungus and an algae or cyanobacteria.
www.moldeffect.com /fglos.html   (1148 words)

  
 Unicellular Organisms
Most of us don't think about these unicellular creatures very much, but they are all around us.
The main groups of unicellular organisms are bacteria, protozoa, unicellular algae, and unicellular fungi or yeasts.
Single-celled organisms have been on earth for perhaps 3.8 billion years, so they have had a long time in which to diversify.
www.edhelper.com /ReadingComprehension_37_180.html   (205 words)

  
 Unicellular microRNA discovery
Qi and colleagues now extend the range of miRNAs into unicellular organisms, with their discovery of a large number of miRNAs in green algae.
The discovery of miRNAs in a unicellular organism has evolutionary implications as well.
While the existence of miRNAs in unicellular and multicellular organisms suggests that the miRNA pathway arose before these lineages split, the lack of universally conserved miRNA genes in algae, plants and animals suggests that they may have evolved independently.
www.eurekalert.org /pub_releases/2007-04/cshl-umd042307.php   (267 words)

  
 Eukaryotes
The majority of the lines of eukaryotes are traditionally classified in a paraphyletic assemblage of mostly unicellular organisms referred to as the protists.
The remaining organisms formed a cluster that was referred to as the eukaryotic crown and was interpreted as the nearly simultaneous separation of animals, plants, fungi and several complex protist assemblages (Knoll, 1992).
Secondly, a variety of the 'amitochondriate' organisms have been shown to have genes for mitochondrial proteins suggesting that they are not primitively amitochondriate but secondarily amitochondriate.
tolweb.org /Eukaryotes/3   (5024 words)

  
 Unicellular Organisms Contribute More Nitrogen To Ocean Than Thought
First identified about five years ago, these organisms — about 7 microns in diameter — are fixing nitrogen at rates up to three times higher than previously reported for the Pacific Ocean, according to research published in the Aug. 26, 2004 edition of the journal Nature.
"To our surprise, these unicellular nitrogen-fixers are broadly distributed spatially and vertically distributed at least down to 100 meters, and they're fixing nitrogen at quite high rates," said lead author Joe Montoya, an associate professor of biology at the Georgia Institute of Technology.
"This group of tiny, photosynthetic organisms, whose contribution to the fertility of the ocean is significant, appears to play a critical role in driving the movement of elements through the ocean both in the upper layer of the water and from the atmosphere into the ocean," Montoya added.
www.spacedaily.com /news/oceans-04z.html   (1000 words)

  
 Niklas: Plants and Animals and the Evolutionary Path - 8 of 17
This dry stuff essentially is the means by which organisms have coped with their physical environment.
If you're unicellular and you go through sexual reproduction, every time two cells meet and fuse and have a good time and then go through meiosis, you get four cells back but you have to put two cells in.
If you plot this process against the number of generations, the number of individuals in a population for a unicellular population versus a simple multi-cellular, you see over a succession of generations that there are more multi-cellular organisms produced every cycle compared to unicellular organisms.
www.accessexcellence.org /BF/bf04/niklas/bf04b8.html   (327 words)

  
 EBI Research - Microarray - Introduction To Biology
Multicellular organisms typically begin life as a single cell, usually as a result of fusion of a male and a female sex cell (gametes).
This may be an indication of the relative complexity of a human compared to a single cellular organism (a similar estimate regarding the relative complexity of an elephant or dinosaur and human may not be flattering for a human).
Since almost all cells in a particular organism have an identical genome (section 3), differences in gene expression and not the genome content are responsible for cell differentiation (how different cell types develop from a fertilised egg) during the life of the organism.
www.ebi.ac.uk /microarray/biology_intro.html   (8024 words)

  
 Water: The Hub of Life
Primitive unicellular forms resembling modern blue-green algae (cyanobacteria) released oxygen, which accumulated in the atmosphere and was deposited in iron oxide beds on the floor of the ocean.
As their number grew, and as their source of food may have declined with the increase in organisms and the rise in oxygen levels in the atmosphere, the prokaryotes adapted to their new environment by developing photosynthesis and other means of using the sun's energy to build structure (negative entropy) upon which to feed.
This was the beginning of the Cambrian period and is noted for the appearance of organisms with hard parts - shells, carapaces and skeletons - that were well preserved in sedimentary rocks to form the fossils that we find today.
www.ozh2o.com /h2origin7.html   (1308 words)

  
 processes do unicellular and multicellular, processes do unicellular and multicellular organisms have in common, ...
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peqeki.rbcmail.ru   (2785 words)

  
 BioEd Online Slides: kingdom, autotrophic, unicellular, taxonomy, Monera
The Swedish scientist, Carolus von Linnaeus, is credited with introducing binomial nomenclature and hierarchical classification as an organized way of naming and describing organisms and their relationships to one another.
Organisms within the same order have more in common with one another than organisms within the same class.
In the 18th Century, organisms were considered to belong to one of two kingdoms, Animalia or Plantae.
www.bioedonline.org /slides/slide01.cfm?q=kingdom   (1620 words)

  
 Microbe...iHygenic.com
A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye).
Microorganisms are often illustrated using single-celled, or unicellular, organisms; however, some unicellular protists are visible to the naked eye, and some multicellular species are microscopic.
All unicellular organisms are able to self-reproduce without help of other organisms, unlike viruses.
www.ihygenic.com /microbe.html   (240 words)

  
 Gravity and the Behavior of Unicellular Organisms - Cambridge University Press   (Site not responding. Last check: )
Unicellular organisms use gravity as an environmental guide to reach and stay in regions optimal for their growth and reproduction.
It reviews the field, discussing the historical background, ecological significance and related physiology of unicellular organisms, as well as various experimental techniques and models with which to study them.
Those working on the biology of unicellular organisms, as well as in related areas of gravitational and space science will find this book of value.
www.cambridge.org /catalogue/catalogue.asp?isbn=0521820529   (208 words)

  
 Cell - Simple English Wikipedia
All prokaryotic organisms are made of just one cell.
Unicellular organisms are made up of one cell.
The cells of a multicellular organism are not all the same.
simple.wikipedia.org /wiki/Cell   (368 words)

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