methylene blue were simultaneously introduced to each well. Methylene blue‚ having the largest molecular weight‚ displayed the smallest diameter (18 mm) and diffused at the slowest rate (0.3668 mm/min.). Thus‚ the higher the molecular weight‚ the slower the rate of diffusion. INTRODUCTION A substance in the gaseous or liquid state consists of molecules or atoms that are independent‚ rapid‚ and random in motion. These molecules frequently collide with each other and with the sides of the container
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Cell Membranes and Transport Hands-On Labs‚ Inc. Version 42-0033-00-01 Exercise 1: Diffusion Observations Data Table 1: Rate of diffusion in different temperatures | | ºC | Minutes | Temperature | InitialTemp. | InitialColor | 5 | 10 | 15 | 20 | 25 | 30 | 60 | Cold | 10°celsius | clear | clear | clear | clear | clear | clear | light purple | light purple | Ambient | 25°celsius
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Cell Membrane Transport The purposes for these experiments is to be able to understand osmosis and its relationship to tonicity of solutions‚ and the transportation of molecules across cell membranes. It’s also used to understand‚ and how temperature affects diffusion. You also learn how to test for presences of starches and sugars in solutions. In the first exercise I will be testing for diffusion through an artificial membranes. This one has forty five steps to it. I will not go into
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behind him and asked him a question‚ “Do you think Julia is pretty”. Pompey pondered the question with interest and replied‚ “Why do you think Julia is pretty”. Now Jamie did not know how to reply to his question even though he started the conversation. “Um never mind I’m going to go eat downstairs”‚ said Jamie. After Jamie left Pompey started wondering about Jamie’s question “Julia is pretty but why would Jamie ask that”‚ he thought to himself. Pompey did not think about the question any further and
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8 themes of biology relating to the cell membrane Science as a process: Science is a process which encompasses many methods in order to reach a final conclusion. This relates to the cell membrane because it carries out many processes to reach a final product. For example‚ the cell membrane forms a barrier between the inside of the cell and the outside‚ so that the chemical environments on the two sides can be different. The cell controls those differences to optimize the working of the organelles
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On this paper we will explain about Webvan‚ when it was established‚ how the people welcoming the idea of having such service through the network and will discuss if Webvan achieved the goals or did it made any profit from its business‚ why they didn’t success and the reason for failed these companies. Webvan was the name of a company and they were doing online grocery delivery business. In 1996 webvan started grocery delivering services it offered customers the convenience of shopping from home
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QUESTION: Do you think Lincoln is an idealist? Why or why not? ANSWER: I consider Lincoln to be more a far-sighted wise man than an idealist his significant contribution to the racial equality throughout the United States as well as other parts in the worldwide. At the beginning of the movie‚ we could see some black corporal requiring higher army status directly from President Lincoln who is also confused by the issue. Apparently‚ he knows the urgency of abolishing negro slavery which would
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Cell Membrane Structure Phospholipids are arranged in to layers‚ called the bilayer. They only have 2 fatty acids‚ this is because the third fatty acid is replaced by a negatively charged phosphate group. The phosphate heads are polar‚ in other words attracted to water‚ therefore they are hydrophilic. The lipid tails are non-popular as they’re not attracted to water and therefore known as hydrophobic. When phospholipids are added to the water‚ they rearrange themselves so that the hydrophilic heads
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LAB REPORT 1 - LAB 7 CELL MEMBRANE FUNCTION Marisela Camacho Legarreta June 30‚ 2013 ACTIVITY 1 INTRODUCTION Be aware that all molecules have kinetic energy‚ which means that is an active energy that is always in motion. Molecules move in all different ways and this create an evenly distributed movement which is best known as diffusion. Diffusion is the movement of molecules from a region of their higher concentration to a lower concentration. METHODS Check the reaction of different
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Cell Membrane Permeability and Osmosis Experiment 3 Objectives: To demonstrate the mechanism involved in Osmosis; To demonstrate the tonicity of solutions by subjecting the cells to different concentration of solute. To view‚ under the microscope‚ any change in the shape and volume of the cells after subjecting them to different concentrations of solutes; To demonstrate the permeability of cell membrane by subjecting the cells to different solutes; To demonstrate the mechanism involved in
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