explorelearning.com) Diffusion is the process in which there is a net movement of molecules from a high area of concentration to a low area of concentration. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane (Semi-permeable membranes are very thin layers of material which allow some things to pass through them but prevent other things from passing through.) to a region of low water concentration. This is seen in cell membranes. When there is a higher concentration
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Direction and concentration gradients Bradley Benton ABSTRACT In this experiment‚ we will investigate the effect of solute concentration on osmosis. A semi‐permeable membrane (dialysis tubing) and sucrose will create an osmotic environment similar to that of a cell. Using different concentrations of sucrose (which is unable to cross the membrane) will allow us to examine the net movement of water across the membrane. INTRODUCTION A major determinant of diffusion in a biological system is membrane
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Ions‚ atoms and molecules are constantly in random motion; this is mainly marked in liquids and gases as they are further apart. When there is a small amount of molecules of a substance in an area and a large number is another area and they have no barrier between them the random motion causes numbers to even up; this is called diffusion. Diffusion is when molecules move from a high concentration to a low concentration. The concentration gradient is when the concentration is different for each
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0M æ Measuring Cylinders (2) æ Ruler (1) æ Potato Cores (30) æ Stop Clock (1) æ Goggles (1) What is Osmosis? Osmosis ¡V A type of diffusion - is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. Diffusion refers to the process by which molecules blend together as a result of their kinetic energy of random motion. Consider two containers of gas A and B separated by a partition; The
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is a thin semi-permeable membrane that surrounds the cell. Its purpose is to hold the structure of the cell‚ protecting and enclosing all of the other organelles within it. The semi-permeable membrane enables substances to move in and out of the cell. The nucleus is like the brain of the cell. It is the biggest organelle in the cell‚ containing the DNA and also controls the activity within the cell. The nuclear membrane is very similar to the cell membrane as it is semi-permeable allowing protein
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water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the water potential gradient) Note: diffusion and osmosis are both passive‚ i.e. energy from ATP is not used. A partially permeable membrane is a barrier that permits the passage of some substances but not others; it allows the passage of the solvent molecules but not some of the larger solute molecules. Cell membranes are described as selectively permeable because not only do they
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molecules from an area of high concentration of sucrose solution to an area of lower concentration of sucrose solution‚ through a selectively permeable membrane. The water molecules move down a concentration gradient in osmosis. Two diagrams of osmosis are shown in figures 1 and 2. Figure 1 shows the diffusion of water molecules through a selectively permeable membrane from an area of highly concentrated sucrose solution to an area of lower concentrated sucrose solution. Figure 2 shows a concentration
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concentration of K+ is about 5mM and the concentration of Na+ is about 150 mM. When you increase the concentration of K+ from 5 to 25 mM and reduce concentration of Na+ from 150 to 130 mM‚ the outside has more concentration of K+. The membrane is permeable to a particular ion‚ that ion will diffuse down its concentration gradient from a region of higher concentration to a region of lower concentration. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative
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December 14‚2012 Alexis‚ Adiba‚ Elliot and Joey Purpose: The purpose of this lab is to get a better understanding of osmosis and diffusion in molecules. We will do this by studying different solutions and how they move through the permeable membrane. Hypothesis: The three different possible predictions were the lab were that the mass would stay the same‚ the mass will increase‚ or the mass will decrease. I predicted that for Section 1 the mass will stay the same‚ System
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acids. 2.) In what way is an organism a protected compartment? Organisms have many layers of cells and material (such as skin) that protect them from the environment. The also arare selectively permeable in determining what they eat. 3.) What is the significance of a membranes being selectively permeable? It allows the cells to control its internal environment. Check and Challenge p 85 1. What is a concentration gradient? How does it affect diffusion? Concentration gradient is a difference
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