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Topic: Prokaryotic cell

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Biological cell

Prokaryote

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	Bacterial Cell Model
		DNA in the bacterial cell is generally confined to this central region.
		Though it isn't bounded by a membrane, it is visibly distinct (by transmission microscopy) from the rest of the cell interior.
		This layer of polysaccharide (sometimes proteins) protects the bacterial cell and is often associated with pathogenic bacteria because it serves as a barrier against phagocytosis by white blood cells.
	www.cellsalive.com /cells/bactcell.htm (0 words)

	Cell (biology) - MSN Encarta
		The smallest cell, a type of bacterium known as a mycoplasma, measures 0.0001 mm (0.000004 in) in diameter; 10,000 mycoplasmas in a row are only as wide as the diameter of a human hair.
		Prokaryotic cells are among the tiniest of all cells, ranging in size from 0.0001 to 0.003 mm (0.000004 to 0.0001 in) in diameter.
		The extraordinary biochemical diversity of prokaryotic cells is manifested in the wide-ranging lifestyles of the archaebacteria and the bacteria, whose habitats include polar ice, deserts, and hydrothermal vents—deep regions of the ocean under great pressure where hot water geysers erupt from cracks in the ocean floor.
	encarta.msn.com /encyclopedia_761568585/Cell_(biology).html (2379 words)

	prokaryotic cell
		A cell lacking a membrane-bounded nucleus or membrane-bounded organelles.
		A prokaryotic organism, such as a bacterium, consists of single prokaryotic cell.
		In a prokaryotic cell, most of the functions of organelles, such as mitochondria, chloroplasts, and the Golgi apparatus, are taken over by the prokaryotic cell membrane.
	www.daviddarling.info /encyclopedia/P/prokaryoticcell.html (179 words)

	Prokaryotic Cell
		Prokaryotic cells are composed of mostly ribosomes and DNA.
		The outer layers of the cell are a cell membrane and a cell wall.
		In gram-positive cells, cells with walls that combine with the dye, the wall consists of a homogeneous layer of peptidoglycans and polysaccharides that ranges from 10 to 80 nanometers in thickness.
	www.infusion.allconet.org /webquest/Prokaryotic_Cell.html (405 words)

	Prokaryotic cell - EvoWiki
		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 also lack cytoskeletons and membrane-bound cell compartments such as vacuoles, endoplasmic reticulum, mitochondria and chloroplasts.
		Prokaryotes have a single chromosome, contained within a nucleoid region rather than a membrane-bound nucleus, but may also have various small circular pieces of DNA called plasmids spread throughout the cell.
	wiki.cotch.net /index.php?title=Prokaryotic_cell (316 words)

	Cell (biology) - Printer-friendly - MSN Encarta
		These cells, which can be rodlike, spherical, or spiral in shape, are surrounded by a protective cell wall.
		Eukaryotic cells are typically about ten times larger than prokaryotic cells.
		Plant cells have all the components of animal cells and boast several added features, including chloroplasts, a central vacuole, and a cell wall.
	encarta.msn.com /text_761568585___20/Cell_(biology).html (1941 words)

	Prokaryotic Cells Part 1- Biology 102 Course - CarolGuze.com
		Prokaryotic cells can be studied only with an electron microscope and that is why their unique cell structure was not known by the earlier light microscopists.
		The ancestor of the first prokaryotic cells diverged into three lineages: the two main prokaryotic lineages are the eubacteria and the archaebacteria and the third was the prokaryotic ancestor of the present day eukaryotes.
		Prokaryotic cells are usually between 1 and 10 microns, while eukaryotic cells are minimally 10 microns and usually larger.
	www.carolguze.com /text/102-5-prokaryoticcells1.shtml (1503 words)

	Prokaryotic and Eukaryotic Cells
		For example, the DNA in the two cell types is precisely the same kind of DNA, and the genetic code for a prokaryotic cell is exactly the same genetic code used in eukaryotic cells.
		There is much more space within a eukaryotic cell than within a prokaryotic cell, and many of these structures, like the nucleus, increase the efficiency of functions by confining them within smaller spaces within the huge cell, or with communication and movement within the cell.
		And the cells in which they reside are completely dependent upon their mitochondria, because the anaerobic respiration they could do without the mitochondria wouldn't provide nearly enough energy for the cell's needs.
	www.cod.edu /people/faculty/fancher/ProkEuk.htm (2063 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 (0 words)

	What is a Cell
		The simplest of cells, and the first types of cells to evolve, were prokaryotic cells—organisms that lack a nuclear membrane, the membrane that surrounds the nucleus of a cell.
		Prokaryotes are distinguished from eukaryotes 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 ribosomes and various sorts of inclusions.
	www.ncbi.nlm.nih.gov /About/primer/genetics_cell.html (8545 words)

	CELL DIVISION: BINARY FISSION AND MITOSIS
		Cancer cells are those which undergo a series of rapid divisions such that the daughter cells divide before they have reached "functional maturity".
		The prokaryotic chromosome is a single DNA molecule that first replicates, then attaches each copy to a different part of the cell membrane.
		Prokaryotes, of course, lack spindles and centrioles; the cell membrane assumes this function when it pulls the by-then replicated chromosomes apart during binary fission.
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookmito.html (1365 words)

	Prokaryotic Cell Division (Site not responding. Last check: )
		In prokaryotic cell division, called binary fission, a membrane attachment mechanism is used to allocate chromosome copies to the two daughter cells.
		A diagram of the attachment of bacterial chromosomes, indicating the possible role of the mesosome (an inward fold of the cell membrane) in ensuring the distribution of the "chromosomes" in a dividing cell.
		Continued growth of the cell gradually separtates the chromosomes.
	home.earthlink.net /~dayvdanls/pcelldiv.htm (78 words)

	Prokaryotic Cells (Site not responding. Last check: )
		Nor are prokaryotic flagella encapsulated by cell membrane as eukaryotic flagella are.
		Although prokaryotic cells do not have a nuclear membrane, prokaryotic cells do have a nuclear region, called the nucleoid, where their chromosomal matter is found.
		Prokaryotic cells' genome usually consists of a single, large, circular DNA molecule that lacks the proteins associated with the DNA of eukaryotic cells.
	www.scientia.org /cadonline/Biology/microbio/prokaryotic.ASP (324 words)

	Cell Structure
		Prokaryotic cell walls are composed at least partially of an interesting substance called peptidoglycan, which is a kind of hybrid between polysaccharide and protein.
		Prokaryotic cells trade plasmids easily and frequently, and the population of plasmids in any prokaryotic cell is pretty much constantly changing.
		When the cell is surrounded by sufficient water, osmosis causes the central vacuole to swell, and thus causes the cell to press against the inside of the cell wall.
	www.cod.edu /PEOPLE/FACULTY/FANCHER/CellStructure.htm (3178 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").
		The cell wall is the target for antibiotics, as well as for carbohydrates that our immune system uses to detect infection.
	www.biology.arizona.edu /cell_bio/tutorials/pev/page2.html (0 words)

	Cell Models
		Living cells are divided into two types - procaryotic and eucaryotic (sometimes spelled prokaryotic and eukaryotic).
		Eucaryotic: The cells of protozoa, higher plants and animals are highly structured.
		These cells tend to be larger than the cells of bacteria, and have developed specialized packaging and transport mechanisms that may be necessary to support their larger size.
	www.cellsalive.com /cells/3dcell.htm (0 words)

	Table of Contents: Cell Biology
		Cell Models - the structure of eukaryotic and prokaryotic cells
		The Cell Cycle - how mitosis fits into a cell's overall life cycle
		Cell CAMS - see cancer cells and bacteria multiplying in real time
	www.cellsalive.com /toc_cellbio.htm (73 words)

	Biology4Kids.com: Cell Structure: Cell Nucleus
		You probably won't find it near the edge of a cell because that might be a dangerous place for the nucleus to be.
		The nuclear envelope is a membrane similar to the cell membrane around the whole cell.
		When the cell is going to divide, the chromatin becomes very compact.
	www.biology4kids.com /files/cell_nucleus.html (359 words)

	Cell Structure and Function
		All cells have a cell membrane, and cytoplasm.
		Eukaryotic cells have a membrane bound nucleus and prokaryotic cells have a nucleoid region containing the genetic material, but it is not membrane bound.
		Prokaryotic and eukaryotic cells also have organelles, the types and numbers of which vary depending on the type of cell.
	www.pc.vccs.edu /biology-labmanual/lab3cells/cellstrfunc.htm (1595 words)

	CELL BIOLOGY: ON THE PROKARYOTIC CELL CYCLE
		During the past few decades, studies of the cell division cycle have revealed many of the genes and proteins that drive and regulate cell* division, and methods for the artificial control of the cell cycle have become apparent.
		The authors report that control of the cell cycle in their application is achieved by artificially expressing a protein that reversibly binds and inactivates any one of the cell division cycle proteins.
		The cycle is considered to begin when two new cells are formed by the division of a single parent cell, and it ends when one of these new cells in turn divides to form two more cells.
	scienceweek.com /2004/sc041105-1.htm (1280 words)

	CHAPTER #2: EUKARYOTIC vs PROKARYOTIC CELLS (Site not responding. Last check: )
		Some cells have #FLAGELLA that are long thin structures that rotate so as to propel the cell; others crawl across solid surfaces and others have stiff fiber-like structures that move like oars.
		During cell division the chromosomes of eukaryotic cells undergo an organized process of chromosome replication that is visible under the light microscope.
		Prokaryotic cells usually contain only a single chromosome and, while its process of replication etc. is also highly organized, it is not visible under the light microscopes.
	www.slic2.wsu.edu:82 /hurlbert/micro101/pages/Chap2.html (1849 words)

	The Cell
		Prokaryotic cells are enclosed by a cell wall made of complex polysaccharides, which are many sugar molecules linked together in a complex way.
		The DNA in prokaryotic cells is usually a long circular molecule, and it is not associated with proteins.
		The cell membrane of animal cells is very important in that it protects the organelles and also keeps unwanted particles from entering the cell body.
	www.dartmouth.edu /~cbbc/courses/bio4/bio4-lectures/theCell.html (2567 words)

	cell (Site not responding. Last check: )
		The cytoplasm is the cell contents with the exception of the nucleus (including the membrane).
		A TEM micrograph and a model of the prokaryotic cell were examined.
		A sketch of a typical prokaryotic cell and a typical eukaryotic cell were examined.
	www.bsu.edu /classes/ruch/Bio111/cell.html (1556 words)

	CELLS: ORIGINS
		Cell Membrane (also known as plasma membrane or plasmalemma) is found in all cells.
		They are not membrane-bound and occur in all cells, although there are differences between the size of subunits in eukaryotic and prokaryotic ribosomes.
		Prokaryote and eukaryote (if they have one) cell walls differ in their structure and chemical composition.
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookCELL1.html (3831 words)

	Prokaryotic cell division protein FtsZ
		ost prokaryotes divide by a process called 'binary fission', whereby one cell gives rise to two daughter cells which are essentially identical with respect to their physiology and genetic content.
		The septum is formed through the inward growth of cytoplasmic membrane and cell wall material that invaginates from opposing directions at the central plane of the cell (2, 7).
		It is a tightly regulated process that involves spatial and temporal controls that function to coordinate the physiological status of the cell, the replication of the chromosome, and chromosomal segregation with cellular division (2, 7).
	www.umass.edu /microbio/chime/pipe/ftsz/present (1627 words)

	Cellular Growth and Division Lesson 1: Prokaryotic Cell Cycle
		The prokaryotic growth cycle is a relatively straightforward process.
		The rate of growth and division in bacterial cells is greatly dependent on environmental factors, such as nutrient availability and temperature.
		Be able to describe the structure of the prokaryotic chromosome and how the two copies of DNA split after replication into two different cells.
	www.sci.uidaho.edu /bionet/biol115/t6_cell_growth/lesson01/lesson1_mod1.htm (140 words)

	ScienceMatrix \| Cell Structure&Function
		Cells and their components are brought to life for middle and secondary school students with inquiry-based learning that both engages and informs.
		Cell Structure and Function has a range of standard features from built-in assessment to definitions for every word.
		Cell Structure and Function is intended for use as supporting material to be used in conjunction with your current textbooks and other teaching materials.
	www.sciencematrix.com /web/modules (0 words)

	BBC - AS Guru - Biology - Cells - Bacteria
		The simplest cells are prokaryotic cells like bacteria.
		Eukaryotic cells are more complex cells and are found in plants, animals and fungi.
		You have chosen to look at a bacterial cell, which is an example of a prokaryotic cell.
	www.bbc.co.uk /education/asguru/biology/01cellbiology/04bacteria/index.shtml (140 words)

	cellusa.net \| Cell Function \| Cell Plants \| Cell Organelle \| Bacteria Cell
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	www.cellusa.net /Cell-Parts.html (0 words)

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