diffusion to take place at a fast rate. The distance a molecule needs to travel across the membrane can also affect the rate of diffusion. If the distance across the membrane is large‚ then the rate of diffusion will be much slower and vise versa. 3. A high temperature can speed up the diffusion process by providing more energy for the molecules and also for eliminating in double bonds in the phospholipid membrane. A low temperature will decline the rate of diffusion‚ as the particles will have less
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exposing the membrane. We also used one shell-less egg for testing the effects of hypertonic and hypotonic environments‚
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longer interacting with the positively charged sodium ions‚ which leaves these negatively charged carboxyl group of these amino acids to repel each other‚ leading to cell lysis. Sugars can also be present in archaeal lipids‚ like the predominant membrane lipids of many Euryarchaeota‚ glycerol diether glycolipids‚ which contain negative charges and are similarly stabilized by interaction with sodium ions (Mescher and Strominger 1976). In halophiles that use the potassium ion as their compatible solute
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semi-permeable membrane and presence of charged particles in solution (ions)‚ enables the cell to have control of an electric potential. The cell The concentrations of Na+ and K+ ions upon either side of a cell’s membrane are not equal. In order for the equilibrium to be restored‚ sodium will attempt to enter the cell‚ whilst potassium will exit the cell. It is this movement that is harnessed to generate electricity. However‚ these ions cannot interact directly with the lipid bi-layer membrane and cross
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AP Biology August 23‚ 2012 Egg Osmosis Lab Definition of osmosis: The diffusion of water across a selectively permeable membrane from high to low concentrations Hypothesis: If I place an egg in vinegar‚ then the outer layer of the egg is going to become slimy and look like rubber. It will also become larger and bubbles will form on and around the egg. Hypothesis: If I place an egg in corn syrup‚ then the egg will become small and the outer layer will not look like rubber any longer. Day one:
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will weigh more after being left in the solution over a 24 hour period. This is because the cell membranes in the potato act as semi permeable membranes (meaning that they only allow certain molecules through). In the clear water the potato will gain mass because the potato will gain water from the solution around it from osmosis. This osmosis effect is the flow of water across the semi permeable membrane from a solution of higher water potential (water) to one with a lower water potential (potato)
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osmosis is a very simple process. It can be defined as the diffusion of water across a permeable membrane. Osmosis can be cellular or artificial‚ so even though we are creating artificial cells in this lab‚ it is still considered to be osmosis. During osmosis‚ a solvent is trying to get through a selectively permeable membrane to make the concentration of that solvent the same on both sides of the membrane. The rate of osmosis depends on the type of environment the cell is in. There are three different
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w w w e tr .X m eP e ap .c rs om June 2003 GCE A AND AS LEVEL MARK SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 9700/01 BIOLOGY Paper 1 (Multiple Choice) Page 1 Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003 Syllabus 9700 Paper 1 Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Key D A C C A C D A B A B C B C D A D A C C Question Number 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Key D B B A C C B B C D A C C D B B D B B C
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relates to this course by the basic information I learned about the plasma membrane known as cell membranes. Cell membranes are lipid bilayers that consist mainly of phospholipids. However‚ when it comes to cancer cell membranes they tend to have more anionic lipids than normal cells. Our course text in Chapter 3 talks about the “Cell Structure” and gives us the break down on “What Exactly is a cell? The Structure of Cell Membranes‚ Introduction of Prokaryotic Cells‚ etc.” This article does not provide
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1: Cell Transport Mechanisms and Permeability: Activity 2: Simulated Facilitated Diffusion Lab Report Pre-lab Quiz Results You scored 50% by answering 2 out of 4 questions correctly. 1. Molecules need a carrier protein to help them move across a membrane because Your answer : a. they are not lipid soluble. Correct answer: d. they are lipid insoluble or they are too large. 2. Which of the following is true of facilitated diffusion? You correctly answered: c. Movement is passive and down a concentration
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