(glucose + ATP → glucose phosphate + ADP)‚ then the concentration gradient of glucose will be kept high‚ and there will a steady one-way traffic. Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated
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1.A) Two main forms of cells exist: eukaryotic cells and prokaryotic cells. Prokaryotic cells are smaller and do not have membrane-bound nucleus or membrane- bound organelles‚ but do have: plasma membrane‚ cytosol and cytoplasm‚ and ribosomes. Prokaryotes contain much less DNA than eukaryotes and have circular chromosomes. Eukaryotic cells have information processing organelles‚ such as the nucleus which houses most of the cell’s DNA‚ and ribosomes which use information from DNA to produce proteins
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Introduction Every cell is selectively permeable to different molecules. This type of selectively is caused by a semi-permeable membrane‚ which allows the movement of certain molecules across it. Water exchange can be measured in two ways: RBC osmotic permeability is measured‚ and diffusional water permeability is measured (Benga and Borza 1995). Diffusion is the movement of high concentration to low concentration. The diffusion of water across a permeable membrane is called osmosis. Water concentration
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across a plasma membrane against their concentration gradient. Allele: different forms of a gene • genotype – the combination of alleles in an organism. Aquaporin: a specialised channel protein in the plasma membrane of a cell‚ which is selectively permeable to water. Attachment protein: a protein in the plasma membrane of a cell that attaches either to the cytoskeleton inside the cell‚ to other cells or to the extracellular matrix. Carrier protein: a membrane protein that facilitates the diffusion
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solutes‚ the solution with the higher solute concentration is called hypertonic and the solution with the lower solute concentration is called hypotonic. Which of the following are true of the plasma membrane? It is fluid. It is selectively permeable. Triglycerides and phospholipids are different because only phospholipids have. A phosphate group attached to 1 carbon atom in the backbone A polar “head” and 2 nonpolar “tails” Transport that requires a cell to expand some of its own energy
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Background Information This experiment is based upon osmosis. Osmosis can be defined as the net movement of water molecules from a region with high concentration to a region with low concentration. This movement must take place across a partially permeable membrane such as a cell wall‚ which lets smaller molecules such as water through but does not allow bigger molecules to pass through. This process will take place until it reaches the equilibrium state‚ which means that the water molecules will be
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direction...there is energy requirement(ATP.NA/K pump) 6.A semi permeable membrane means that the membrane is selective in what is allowed into the cell. Some items such as toxins or some proteins are too big to enter the cell with out facilitaion. Other things such as gas and water are small enough to pass through. These items are usually hydrophilic and ionic it makes them easier to pass through the membrane. So basically semi permeable means somethings can get through without the help of diffusion
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1. DHMO is actually ordinary H20. So there are no effects of ingesting it. Unless like it says “accidental inhalation of its liquid form” then that may result in drowning. 2. Two chemical issues that DHMO is alleged to are acid rain and accelerates rusting of many metals. 3. DHMO is H20. Commonly called water. 4. Bob Becker wrote this article in an ordinary newspaper style to trick people that it is a newspaper article. He is trying to scare people and show them what the media can do
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Title: Effect of Polarity In Diffusion Of Molecules Across Cellular Membrane Abstract: Cell membranes play an important role in regulating what goes in and out of the cell. Diffusion‚ the process of movement of substances across the cell membrane from higher concentrations to areas of lower concentration‚ plays an active role in the transport and the regulation through cellular membrane. Sometimes‚ there are cases when cells are placed in hypotonic solutions and substances will diffuse through the
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be expelled because it is a waste product and the body has finished using all of the oxygen. There are several factors that make for an efficient gas exchange system. These include a large surface area for taking in the oxygen‚ has to have a thin permeable membrane that always remains moist. Also the shorter the diffusion distance the more effective the gas exchange system. The gas diffusion system for three species is discussed
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