ABSTRACT: This experiment was to observe diffusion happening within the cells‚ and to help understand the sizes of molecules and how the chemical reactions take place. Therefore‚ the experiment was conducted using glucose and starch solution inside the dialysis tube. The starch and glucose that was put inside the dialysis tube help identify which of the two will reacted with potassium iodide inside the breaker‚ as the latter passed from the beaker into the tube‚ the glucose/starch solution’s change
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this lab we will look at how molecules move across the membrane of a cell . Osmosis is the movement of water across a cell membrane.In osmosis the cell membrane is selectively permeable‚which allows for the membrane to control what types of substances that passes through.Transportation can either be passive or active.Passive transport does not require the use of added energy where as active transport requires the cell to use energy. Diffusion is the simplest form of passive transport. Using its own
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into useable energy for life functions F. Homeostasis - The tendency of living organisms to control or regulate changes in their internal environment G. Diffusion - The movement of molecules from an area of high concentration to an area of low concentration H. Osmosis - The diffusion of water across a selectively permeable membrane I. Osmoconformer - An organism that allows its internal concentration of salts to change in order to match the external concentration of salts in the surrounding
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against the concentration gradient. This process disrupts the equilibrium caused by diffusion. Active transport is
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Questions 1. Which of the following is not a distinguishing characteristic of prokaryotic cells? a. Their DNA is not associated with histones. b. They have cell walls containing peptidoglycan. c. They lack membrane-enclosed organelles. d. Their DNA is not enclosed within a membrane. e. None of the above. 2. Which of the following is not true about a gram-positive cell wall? a. It contains teichoic acids. b. It protects the cell in a hypertonic environment. c. It is sensitive to
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This week we explore a number of important concepts in Chapter 5 concerning energy and how reactions are facilitated in cells. In this conference please provide a brief description of one of the following topics: What is energy? The capacity to cause change‚ or to move matter in a direction it would not move if left alone. A child pushing a ball‚ the energy is transferred from the muscle of the child to the ball forcing the ball to move. What is kinetic energy? The energy of motion‚ moving
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on the lab. Introduction Diffusion and Osmosis are two concepts that go hand in hand with each other. Diffusion is simply described as the movement of a substance from a region of high concentration to a region of low concentration. In another words‚ the substance will move down its concentration gradient which is “the region along which the density of a chemical substance increases or decreases” (Campbell Biology pg. 132). If you understand the concept of diffusion then osmosis is a very simple
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this experiment was to test different solute concentrations on the rate of osmosis. Artificial cells were filled with different solute concentrations and placed in water and weighed at equal time intervals to show how the water moves across cell membranes and down its concentration gradient into the lower concentrated area. The weights of the cells were recorded each interval‚ and then the rate of osmosis was found by calculating the corrected cumulative change in weight. The prediction made was
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molecules outside the cell as inside. The SWELLING AND BURSTING of animal cells when water enters is called cytolysis. This happens when a cell is placed in a hypotonic solution. The SHRINKING of plant cells when water leaves so the cell membrane pulls away from the cell wall is called plasmolysis. It happens when a plant cell is placed into hypertonic solution. The shrinking of ANIMAL cells that are placed in a HYPERTONIC solution is called crenation. Cells stay the same size when
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Hypothesis - If the glucose and starch solution stays within the beaker of water for a longer period of time‚ then more water will travel through the selectively permeable membrane due to the effects of diffusion on the solution. If the level of sucrose within the solution increases‚ then the effects of osmosis will cause the change in mass to also increase due to higher concentrations of sucrose and the increased net movement of the water molecules within the solution. Analysis - When the glucose
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