Molecular diffusion

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    Osmosis Essay

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    Objective: The objective of this lab is to show how diffusion occurs with different types of osmosis. This is done with varying concentrations of solute. Introduction: To fully understand this experiment you should have a solid basis of background information on a few a topics. The cell membrane, for example, is the flexible barrier which surrounds the cell (see Figure 1). This organelle controls what is able to enter and exit the cell, which is known as selective permeability. The permeability of a cell membrane affects the concentration gradient between the inside and outside of the cell. Figure 1: Structure of the cell membrane A concentration gradient in relation to a cell is the contrast between concentrations divided by the cell membrane. Diffusion has the capability to change the…

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    Red Onion Cells Lab Report

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    d. This lab clearly demonstrated that cells maximize surface area to volume ratios. With a greater surface area, diffusion takes place over a larger surface and is much more effective. Cells rely on movement of particles through diffusion to carry out activities. If cells were too big, diffusion would take too long because although there is still a large surface in which diffusion can occur, the large volume catches up to the surface area and requires more diffusion. The .5x.5x.5 cm agar cube…

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    Gas Exchange

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    Gas Exchange Gas exchange is the process in which gases enter and leave a body by diffusion across gas exchange surfaces. Gas exchange is important as it transfers oxygen from surroundings of an organism to individual cells in the organism’s body, needed by the cells for respiration to occur. Carbon dioxide is released. This process produces energy which is essential to an organism for survival. Group 1 – Insects The definition of an insect is any of a group of small and often winged animals…

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    As stated in the introduction the hypothesis for this experiment was that the solution beginning with the higher concentration of KMnO4 and placed in water with the warmer temperature will diffuse through the artificial membrane quicker than the solutions beginning with the already diluted solutions and placed in water at a cooler temperature. This occurring because all of the solutions are trying to diffuse to where it is less concentrated because they are eager to diffuse down its…

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    Cell Transport Lab Report

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    a selectively permeable membrane, and this process can occur in two ways; passive transport and active transport. Passive transport allows substances to cross the membrane without any use of energy, and this includes simple diffusion, facilitated diffusion, filtration, and osmosis. Active transport however, requires the use of ATP, or energy, to move across the membrane. Diffusion is the movement of…

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    Ribosomes are the actual site of protein synthesis (Marieb P44). The packaging of proteins and other substances that are being ready to be exported out of the cell and into the plasma membrane is done by the golgi apparatus. From there, the plasma membrane has two processes of exportation, active and passive processes. Passive transport has two important processes known as diffusion and filtration, diffusion being most important because it is the means of transportation for every cell in the…

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    it the skin of the cell. The plasma membrane does many things, but the main thing is it allows the diffusion of molecules.…

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    Endocytosis And Osmosis

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    different ways that it allows molecules and ions to cross its membrane, including bulk transport, osmosis, passive transport, and active transport. The purpose of the cell membrane is to protect the cell and only allow specific substances to cross the membrane, such as amino acids or water. Lipids hold the membrane together, along with proteins and carbohydrates. These lipids are saturated or unsaturated, and have a hydrophilic head. The tails hold the membrane together due to their fear of…

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    Glucose Diffusion Lab

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    Introduction Most aspects of a cell depend on the fact that atoms and molecules have kinetic energy and are constantly in motion. Kinetic energy causes molecules to bump into each other and move into different places. Diffusion is the random movement of molecules from an area of higher concentration to an area of lower concentration. Cells have selectively permeable membranes that only allow the movement of certain solutes. Diffusion is vital for many of life’s functions in a cell. It allows…

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    Diffusion And Osmosis

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    Particles can move. One type of movement is diffusion. Diffusion is when particles move from an area of higher concentration to an area of lower concentration. The particles can move throughout a liquid, an area , or through a semipermeable membrane. Diffusion can be facilitated or non facilitated. When no other factors are involved in diffusion the particles are moving down their concentration gradient so that the amount of particles can be evenly distributed. if proteins or helpers are…

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