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| | Cell (biology) - Wikipedia, the free encyclopedia |
 | | The first pathway, glycolysis, requires no oxygen and is referred to as anaerobic metabolism. | | | Another theory holds that the turbulent shores of the ancient coastal waters may have served as a mammoth laboratory, aiding in the countless experiments necessary to bring about the first cell. | | | Other organisms, such as humans, are multicellular, (humans have an estimated 100,000 billion or 10 |
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http://en.wikipedia.org/wiki/Cell_(biology)
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| | CELLS II: CELLULAR ORGANIZATION |
| | Cell movement; is both internal, referred to as cytoplasmic streaming and external, referred to as motility. | | | The theory of ___ was proposed to explain the possible origin of chloroplasts and mitochondria. | | | These are not structures as such but rather are associated with actin near the moving edge. |
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookCELL2.html
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| | MEMBRANES |
| | The proposed mechanism of the Na ATPase shows the role of ATP in effecting the conformational change. | | | These channels are specific for a given ionic species. | | | Either positive or negative responses may occur, even in the same tissue, depending on the type of receptor. |
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http://www-medlib.med.utah.edu/NetBiochem/membrane.htm
(2845 words)
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| | Cell Resting Membrane Potential |
| | This change creates an affinity of the molecule for K | | | First you might check yourself with the QandA exercise below. | | | Shortly, you will understand that this would make nerve and muscle cell function impossible. |
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http://sky.bsd.uchicago.edu/lcy_ref/synap/resting.html
(3047 words)
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| | Howstuffworks "How Cells Work" |
| | The largest human cells are about the diameter of a human hair, but most human cells are smaller -- perhaps one-tenth of the diameter of a human hair. | | | Your body is made of about 10 trillion cells. | | | A typical human cell might be one-tenth of the diameter of your hair (10 microns). |
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http://science.howstuffworks.com/cell1.htm
(488 words)
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| | Membrane Structure and Function |
| | This also allows movement of other components of the membrane. | | | As you study different organelles, you will learn about important membrane proteins that function for that particular organelle. | | | The turning point in the modeling came with the advent of freeze fracture techniques. |
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http://cellbio.utmb.edu/cellbio/membrane_intro.htm
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| | Cell membrane fusion |
| | This research, which could lead to more efficient drug delivery processes and gene therapy techniques, was performed at the National Synchrotron Light Source (NSLS) at the U.S. Department of Energy’s Brookhaven National Laboratory, and Rice University. | | | “Understanding the details of membrane fusion may help scientists find the appropriate conditions for preventing viruses such as HIV from fusing to and thereby infecting human cells,” Yang says. | | | “This knowledge could also lead to the design of systems in which a drug or a piece of DNA is enclosed in a membrane known to fuse with specific cells in our body, thus facilitating drug delivery or improving gene therapy.” |
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http://www.bnl.gov/bnlweb/pubaf/pr/2002/bnlpr091202.htm
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| | Botany online: Membranes and Transport |
| | Can they change into each other and how would such a membrane flow look like? | | | Protein parts in contact with the aqueous phase are often glycosylated. | | | The differences can be of a qualitative or quantitative nature. |
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http://www.biologie.uni-hamburg.de/b-online/e22/22.htm
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| | The Cell Membrane |
| | A gap junction consists of pairs of channels fused. | | | A tight junction consists of fusing the cells together. | | | It also communicates with other cells for example with receptors on the surface or cell to cell adhesion. |
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http://sun.menloschool.org/~cweaver/cells/c/cell_membrane
(338 words)
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| | Cell membrane - Wikipedia, the free encyclopedia |
| | These membrane proteins are important for the regulation of cell behavior and the organization of cells in tissues. | | | This means that only some molecules can pass unhindered in or out of the cell. | | | Cells may vary the variety and the relative amounts of different lipids to maintain the fluidity of their membranes despite changes in temperature. |
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http://en.wikipedia.org/wiki/Cell_membrane
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| | UCMP Glossary: Cell biology |
| | The lyzosome fuses with a vacuolar membrane containing ingested particles, which are then acted upon by the enzymes. | | | Found in many protists, including some flagellates, ciliates, chrysophytes, and choanoflagellates, as well as in some animal cells. | | | cell -- Fundamental structural unit of all life. |
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http://www.ucmp.berkeley.edu/glossary/gloss4cell.html
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| | [No title] |
| | The membranes surrounding the internal organelles, such as the endoplasmic reticulum, Golgi bodies, lysosomes and vacuoles use this action to help carry out their functions. | | | Even your own cells, if they change somehow (like when they get cancer), can be destroyed by your immune system. | | | With more research, it turns out the cell membrane is very important in a wide range of cell activities including functions related to cancer and AIDS. |
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http://projects.edtech.sandi.net/miramesa/Organelles/memb.html
(406 words)
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| | The Cell |
| | And there are cells that only function when part of a larger organism, such as the cells that make up your body. | | | The cell is one of the most basic units of life. | | | The cell is the smallest unit of life in our bodies. |
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http://web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm
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| | cellmembrane |
| | They may also be involved in cell signalling and cell recognition, or they may be enzymes, such as maltase in the small intestine (more in digestion). | | | This is compartmentalisation is essential for life, as it enables reactions to take place that would otherwise be impossible. | | | It controls how substances can move in and out of the cell and is responsible for many other properties of the cell as well. |
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http://www.biologymad.com/cells/cellmembrane.htm
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| | The Cell Membrane |
| | In essence membranes are essential for the integrity and function of the cell. | | | Membranes help organize the cell into domains and microdomains. | | | The cell is highly organized with many functional units or organelles. |
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http://cellbio.utmb.edu/cellbio/membrane.htm
(412 words)
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| | cell membrane - definition of cell membrane by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | cell - (biology) the basic structural and functional unit of all organisms; cells may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals | | | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. | | | semipermeable membrane - a membrane (as a cell membrane) that allows some molecule to pass through but not others |
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http://www.thefreedictionary.com/cell+membrane
(153 words)
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| | Chapter 2.1: Phospholipid/Cell Membrane |
| | First would be a micelle which would like like a ball with the phospholipid heads on the outside and the tails pointing together like this or in the form of a lipid bilayer: | | | Cholesterol is a major component of cell membranes and serves many other functions as well. | | | The membranes of cells are a fluid, they are semi-permeable, which means some things can pass through the membrane through |
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http://ccgb.umn.edu/~mwd/cell_www/chapter2/membrane.html
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| | The Cell Membrane |
| | This is important in keeping the shape of the cell and to hold the membrane in a certain place when needed. | | | Each cell has a different signature, and the forms of these signatures vary in animals and humans. | | | The cell membrane is probably the most important organelle in the cell. |
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http://www.cdli.ca/~dpower/cell/mbrane.htm
(423 words)
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| | Cell Membrane |
| | The cell membrane is a selectively permeable barrier that allows some substances to pass through to the inside of the cell while keeping others out. | | | These proteins give the membrane much of its ability to selectively allow some substances out while allowing others in. | | | In order to understand how the cell membrane functions to regulate flow into and out of a cell, it is important to understand the structure of a typical membrane. |
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http://crystal.uah.edu/~carter/osmosis/membrane.htm
(273 words)
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| | Introductory Biology: Lab 3 for 71.125 - Cell Membrane Physiology |
| | In cells, water movement through the cell membrane is determined by the process of osmosis. | | | The membrane may be permeable, impermeable or partially permeable to a given substance. | | | The following exercises are designed to help you understand the cell as a functional unit. |
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http://www.umanitoba.ca/faculties/science/biological_sciences/lab3/biolab3_3.html
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| | Lesson 7 Glossary |
| | - in plant cells, a tough, rigid structure made up of cellulose which is outside of the cell membrane; provides physical support and helps cells resist osmotic pressure. | | | - the part of the cell which separates the external environment from the cytoplasm; cell membranes have hydrophilic external surfaces and hydrophobic interiors. | | | - membrane-bound structures found inside the cell cytoplasm. |
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http://www.biologylessons.sdsu.edu/ta/classes/lab7/glossary.html
(624 words)
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| | Life Science Safari - Cell Membrane |
| | The cell membrane is a structure that forms the outer boundary of the cell and allows only certain materials to move into and out of the cell. | | | Cells that perform photosynthesis (plants and some protists) take in carbon dioxide through the cell membrane instead of oxygen. | | | The cell membrane allows only certain materials to move in and out of the cell |
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http://vilenski.org/science/safari/cellstructure/cellmembrane.html
(72 words)
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| | Cell Organelles: Membrane and Cytosol |
| | Though mostly water, the cytosol is full of proteins that control cell metabolism including signal transduction pathways, glycolysis, intracellular receptors, and transcription factors. | | | : The cytosol is the "soup" within which all the other cell organelles reside and where most of the cellular metabolism occurs. | | | The membrane is responsible for the controlled entry and exit of ions like sodium (Na) potassium (K), calcium (Ca++). |
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http://www.cellsalive.com/cells/membrane.htm
(105 words)
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| | Membrane Lecture Notes |
| | Others may be tethered to structures in the cytoplasm or extracellular spaces, thus restricting their movement. | | | Short strings of hydrophilic amino acids separate the hydrophobic sequences from each other: These hydrophilic stretches tend to be found exposed to the more aqueous environments associated with the cytoplasm or the extracellular space. | | | At high temperatures cholesterol tends to reduce membrane fluidity, probably by interacting with the hydrocarbon tails of the phospholipid and glycolipid molecules. |
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http://www.d.umn.edu/~sdowning/Membranes/lecturenotes.html
(530 words)
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| | HUPE - Multimedia - Cellbiology/Cell membrane |
| | Within the cells, there are double membrane systems with protein molecules at different locations therein which make each individual membrane unique, lending them special features and executing their special functions. | | | The permeability of the membrane barrier, a factor desirable for certain substances is controlled by different protein molecules within the cell membrane; these are either pores or transport proteins called carriers. | | | Inside the membrane, the hydrophobic ends of molecule are engaged in each other, with the hydrophilic parts facing the watery medium. |
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http://www.hupe.hu/szerv/tanszekek/kio/im/oktat/SEJTBIO/sejtmembran/cellmemb.html
(371 words)
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| | Cell Membrane |
| | Soon after life began there evolved a thin oily skin around a group of living molecules. | | | It is not clear how or why the membrane was first formed, but it was a great step forward for life. | | | As life developed, new proteins evolved which could use the special properties of the membrane. |
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http://www.historyoftheuniverse.com/cell.html
(252 words)
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| | The Virtual Cell Textbook - Cell Biology |
| | The cell membrane is the thin nearly invisible structure that surrounds the cytoplasm of the cell. | | | In this section we will talk about its structure and its function. | | | In the image at the left you can see that it is a continuous membrane that completely surrounds the cell. |
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http://personal.tmlp.com/Jimr57/textbook/chapter3/cm.htm
(85 words)
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| | Biology4Kids.com: Cell Structure: Cell Membrane |
| | Everything in life is made of smaller pieces and a membrane is no different. | | | Some of them are found on the inside of the cell and some on the outside. | | | The holes are there to let some things move in and out of the cell. |
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http://www.biology4kids.com/files/cell_membrane.html
(313 words)
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| | Cell Membrane |
| | It also allows the cell to be recognized within the structure. | | | The cell membranes primary function is to act as protection. | | | It regulates the transport of proteins in and out of the cell and allows selective signals to provide places for binding of signaling molecules by having a semi-permeable membrane. |
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http://www.geocities.com/englands4/cellmembrane.htm
(63 words)
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| | The Cell Membrane |
| | It has pores and is selectively permeable allowing the movement of certain substances into and out of the cell. | | | The cell membrane is found in both plant and animal cells. | | | The animal cell membrane contains cholesterol, but the plant cell does not. |
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http://www.usoe.k12.ut.us/curr/science/sciber00/7th/cells/sciber/membrane.htm
(106 words)
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