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Topic: Cell division


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  Cell division - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
Cell division (or local doubling) is the process by which a cell, called the parent cell divides into two cells, called daughter cells.
Cell divisions is usually a small segment of a larger cell cycle.
Furthermore, the pattern of cell division that transforms eukaryotic stem cells into gametes (sperm in males or ova in females) is different from that of eukaryotic somatic (non-germ) cells.
en.wikipedia.org /wiki/Cell_division   (575 words)

  
 Cell cycle - Wikipedia, the free encyclopedia
The cell cycle, or cell division cycle, is the cycle of events in a eukaryotic cell from one cell division to the next.
The cell cycle is regulated by cyclins and cyclin-dependent kinases.
They can let the cell know whether to repair the damage or initiate programmed cell death, a form of which is called apoptosis.
en.wikipedia.org /wiki/Cell_cycle   (475 words)

  
 cell division - Hutchinson encyclopedia article about cell division   (Site not responding. Last check: 2007-11-07)
Cells are the basic units of life and they carry out basic functions that are characteristic of living organisms, such as growth and reproduction.
In sexual reproduction the cell division that is used is meiosis.
In cell division, the duplicated chromosomes are separated from each other into daughter cells.
encyclopedia.farlex.com /cell+division   (303 words)

  
 Cell Division: The Role Of Mitosis And Meiosis   (Site not responding. Last check: 2007-11-07)
Division of the cytoplasm (referred to as cytokinesis) separates the two equal pools of genetic material into identical daughter cells.
Mechanistically, this is identical to the nuclear division associated with mitosis except that the cells are haploid instead of diploid.
The mitotic index is the ratio of dividing cells to the total number of cells in a population.
www.pickens.k12.sc.us /phsteachers/edmunds/AP%20Cell%20Division%20WS.htm   (1254 words)

  
 Cell Division and Mitosis
Cells need to replicate the chromosomes before dividing to ensure that the newly formed cells contain the same genetic material (chromosomes).
Students are to make a model of a cell which is in the process of mitosis and cell division.
There needs to be a cell border for interphase, prophase (perhaps one for early and late prophase), metaphase, a partially dividing cell for anaphase, a nearly totally divided cell for telophase, and two new cells for the daughter cells.
www.iit.edu /~smile/bi9206.html   (1402 words)

  
 CELL DIVISION: BINARY FISSION AND MITOSIS
The Cell Cycle is the sequence of growth, DNA replication, growth and cell division that all cells go through.
Cancer cells are those which undergo a series of rapid divisions such that the daughter cells divide before they have reached "functional maturity".
Whereas mitosis is the division of the nucleus, cytokinesis is the splitting of the cytoplasm and allocation of the golgi, plastids and cytoplasm into each new cell.
www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookmito.html   (1365 words)

  
 Mitosis - cell division
Unless a cell is about to divide, or is in the process of dividing, the chromosomes within its nucleus are not obvious.
The two new cells have the same number of chromosomes as the parent cell and are identical to it and to each other.
Another type of cell division is meiosis, which results in the formation of 4 new cells which have half the number of chromosomes of the parent cell.
www.microscopy-uk.org.uk /mag/artaug99/mitosis.html   (472 words)

  
 Cell Division   (Site not responding. Last check: 2007-11-07)
Eukaryotic organisms posses the nucleus and cell organelles.
Cell wall is the rigid structure that surrounds the plant cell.
The protoplast is the living portion of the cell and consists of the nucleus and the cytoplasm.
carroll1.cc.edu /~jclausz/botany/CellStructure.html   (1089 words)

  
 Lab 3 Cell Biology
A non-dividing or interphase cell is not a resting cell, as it is sometimes described, since it is during this period that the cell carries out all of the normal activities (growth, respiration, protein synthesis, etc.) of the cell with the exception of division.
Within dividing cells, the S phase is critical in that this is the period during which the DNA is replicated in preparation for the next division.
Cells not destined to divide again (i.e.: certain epithelial cells, nerve cells, differentiated muscle cells, etc.) stop in the G1 phase and never enter the S phase.
www.umanitoba.ca /faculties/science/biological_sciences/lab3/biolab3_5.html   (758 words)

  
 Cell Division and Cancer
Cells with centrioles contain a third group of shorter spindle fibers rhat radiate outward from the centriole and are collectively known as an aster.
The chromosome that is the same in the cells of both males and females is known as the X chromosome.
The dissimilar chromosome characteristic of the cells of males is known as the Y chromosome.
www.biologie.uni-hamburg.de /b-online/library/falk/cellDivision/division.htm   (3037 words)

  
 Cell Cycle: An Interactive Animation
Interphase, which appears to the eye to be a resting stage between cell divisions, is actually a period of diverse activities.
An important cell cycle control mechanism activated during this period (G1 Checkpoint) ensures that everything is ready for DNA synthesis.
All of the cell's energy is focused on the complex and orderly division into two similar daughter cells.
www.cellsalive.com /cell_cycle.htm   (361 words)

  
 The Cell and Cell Division   (Site not responding. Last check: 2007-11-07)
This lesson is designed to help students visualize plant and animal cells, understand the parts of a cell and their functions and distinguish plant cells from animal cells.
The cell and companion poster must accurately represent the organelles of the cell for structure and function.
Students will 1) observe, compare and describe cell organelles in terms of their function, structure and operation; 2) enter and edit information in a database; 3) build and sort a student-designed database; and 4) find records in a database.
www.botany.uwc.ac.za /Sci_ed/teacher/lessons/cellinks.htm   (251 words)

  
 Cell division
Since organisms start from one cell, yet adults may contain billions of cells, a process for producing new identical cells is required.
When cell is approximately twice its original length, the plasma membrane grows inward, a new cell wall forms, dividing the cell into two approximately equal daughter cells
Cell division in eukaryotes involves nuclear division and cytokinesis (division of the cytoplasm)
arnica.csustan.edu /Biol1010/cell_division/cell_division.htm   (654 words)

  
 BIO 304. Ecology & Evolution: Genetics   (Site not responding. Last check: 2007-11-07)
A single division of a cell, which results in two daughter cells that are genetically identical to one another and to their mother cell.
Two consecutive divisions of a particular cell type, which results in four daughter cells that have half of the chromosome number of their mother cell.
Cells with an odd number of chromosome sets normally can not carry out meiosis, as chromosome pairing is messed up (see sympatric speciation by polyploidy in the section Macroevolution).
www.micro.utexas.edu /courses/levin/bio304/genetics/celldiv.html   (186 words)

  
 UW-Madison, Cell Division
The discovery promises a better understanding of the role of cell division in the growth and development of all organisms and, critically, of abnormal cell division, when the key proteins fail.
However, just as cell division is the key to life, failures in the process can lead to certain diseases, says Skop.
"The problems ranged from cells where chromosomes failed to separate normally, leaving extra DNA in one of the new cells, as is seen in Down's syndrome, for example, to cells in which the dividing membrane would begin to form normally and would suddenly retract before the cells could separate," Skop says.
www.wisconline.com /feature/celldivision.html   (841 words)

  
 cancer cell division
overexpression in cancer cells, and the effects of mutations and truncations of survivin on cell division and apoptosis...
Scientists use x-ray crystallography to decipher the structure of a pkey protein involved in cell division.
The process of cell division is driven by a cascading path of signals, with each event catalyzed by...
www.youramazinglife.com /cancercures/6/cancer-cell-division.html   (286 words)

  
 Cell Division   (Site not responding. Last check: 2007-11-07)
Cell division is the first stage of growth in living organisms whereby cells divide to form new cells.
In mitosis is cell division an aspect of growth and is accompanied by cellular enlargement and differentiation.
During the development of the embryo, there is continual mitotic division and growth of the cells, starting with the division of the fertilized egg.
www.botany.uwc.ac.za /sci_ed/grade10/cells/cell_division.htm   (426 words)

  
 Cell Division: Meiosis & Mitosis   (Site not responding. Last check: 2007-11-07)
Cells Alive - This animation demonstrates the stages of mitosis in an animal cell.
Cell Cycle/Mitosis - A tutorial for the seven (7) phases of the cell cycle along with an animation of mitosis.
Cell Division: Meiosis and Mitosis - Using information provided, students will name, identify, and describe the events of meiosis and mitosis, and describe the similarities and differences between the two.
www.kn.sbc.com /wired/fil/pages/listmeiosisst.html   (506 words)

  
 ISSCR :: Scientists : Topic of the Month January 2004
Asymmetric cell divisions are characteristic of any occasion when the two daughters differ in fate, whether or not "stem cell" is one of the fates.
In the case of the stem cell, the cell's first step must be to divide and to produce one daughter like itself, able to continue as a stem cell, and one daughter unlike itself, able to go down a path of differentiation.
In the case of Volvox, an asymmetric cell division generates cells different only by size, and then by as yet unknown mechanisms the size of the daughter cell leads to activation of either a somatic or germline program.
www.isscr.org /scientists/TOM/Jan2004.htm   (1454 words)

  
 Cancer Cell Division Research   (Site not responding. Last check: 2007-11-07)
The process of cell division is driven by a cascading path of signals, with each event catalyzed by a unique enzyme.
Scientists from LBL's Structural Biology Division, in collaboration with colleagues at UC Berkeley and UC San Francisco, have achieved an important step toward realizing this strategy -- by solving the three-dimensional structure of a key protein that triggers the last step of the events which culminate in cell division.
Various types of kinases are involved in the chain of reactions that follow cell stimulation by a growth factor.
www.lbl.gov /Science-Articles/Research-Review/Highlights/1993/cancer-cell.html   (445 words)

  
 CancerQuest : Cell Division : Introduction
White blood cells such as B and T lymphocytes are part of the body's immune system and help to ward off infections.
The process by which a cell reproduces to create two identical copies of itself is known as mitosis.
As we will see, many of the features of cancer cells are due to defects in the genes that control cell division.
www.cancerquest.org /index.cfm?page=51   (349 words)

  
 SUGAR HELPS CONTROL CELL DIVISION
The comings and goings of the sugar on proteins seem to be important controllers of cell division, say the researchers.
In experiments with human cells and mouse cells, Slawson and his colleagues showed that preventing a cell from removing the sugar from proteins causes the cell to copy its genetic material and make new nuclei, but to fail to divide in two.
On the other hand, cells that had higher than normal amounts of the enzyme that removes the sugar from proteins ended up with nuclei that didn't look right under a powerful microscope.
www.hopkinsmedicine.org /Press_releases/2005/09_20_05.html   (724 words)

  
 Dr Chromo's school: mitosis
The act of cell division is normally a single process, but it can be broken down into a number of "phases".
The diameter of the cell decreases at the equator.
When the protein is attached to the receptor, it triggers several events in the cell that end with the division of the cell.
www.rothamsted.bbsrc.ac.uk /notebook/courses/guide/mitosis.htm   (533 words)

  
 Cancer. Cell division: mitosis and meiosis.   (Site not responding. Last check: 2007-11-07)
This happens in all the body cells and is used for growth and repair.
These cells contain chromosomes that are single, rather than in their matched pairs.
An extra chromosome is carried into one of the sex cells and this gives the fertilised egg the additional chromosome 21 that causes Down's syndrome.
www.schoolscience.co.uk /content/4/biology/abpi/cancer/cancer3.html   (369 words)

  
 Prokaryotic cell division protein FtsZ
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).
Much concerning the regulatory mechanisms that coordinate the cell cycle and timing of division, as well as many aspects of the division process itself, remains elusive and a clearer understanding of these processes is desirable (4).
www.umass.edu /microbio/chime/pipe/ftsz/present   (1627 words)

  
 Mitosis - cell division
Just before cell division starts, a lot of metabolic activity occurs, the chromosomes start to gradually shorten and thicken.
Once at the equator of the cell, the centromeres attach to threads of a spindle structure that has formed.
Contraction of the spindle fibres begins to cause the chromatids to pull apart from one another and move towards opposite ends of the cell.
www.microscopy-uk.org.uk /mag/artaug99/mitosis2.html   (196 words)

  
 Publications from the Carcinogenic Potency Project. Cell Division and DNA Lesions are key factors in mutagenesis, ...   (Site not responding. Last check: 2007-11-07)
Cell Division and DNA Lesions are key factors in mutagenesis, carcinogenesis, and cancer prevention
Ames, B. N., and Gold, L. Cell Division and DNA Lesions are key factors in mutagenesis, carcinogenesis, and cancer prevention.
Also key is the rate of cell division, which is influenced by hormones, growth, cytotoxicity, and inflammation, as this determines the probability of converting DNA lesions to mutations.
potency.lbl.gov /abstracts/encyclopedia.cancer.html   (261 words)

  
 CancerQuest : Cell Division : The Cell Cycle
This refers to the fact that nothing very obvious is occurring in the nucleus of the cells during these stages.
This is the phase of the cell cycle in which the DNA is copied or replicated.
This is the stage of the cell cycle in which the cell actually divides into two daughter cells.
www.cancerquest.org /index.cfm?page=58   (150 words)

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