Lecture: Plasma Membrane and Transport I. Structure of the Plasma Membrane A. plasma membrane - the surface encapsulating a cell B. Fluid Mosaic Model 1. bilayer of phospholipids a. hydrophilic heads - P04 end "water" "loving" attracted to water on inner/outer parts of cell b. hydrophobic tails - fatty acids "water" "fearing" attracted to each other on inside of bilayer c
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stimulation of the maggots crawling over the wound33 although this is now considered unlikely. Allantoin‚ (2‚5-Dioxo-4-imidazolidinyl) urea‚ a product of purine metabolism found in maggot secretions but first isolated from Comfry root and still used today in some cosmetics and pharmaceuticals‚ was claimed to be responsible for this effect34. Ammonium bicarbonate21 and urea‚ too‚ were found to be active constituents. Subsequently‚ allantoin and urea35 ammonium bicarbonate21 and mixtures of calcium carbonate
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level BIOLOGY Paper 1 Multiple Choice October/November 2005 1 hour Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 5090/01 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the answer sheet in the spaces provided
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electrolyte solution. All inorganic solvents‚ good acid‚ alkaline‚ or salt having the properties able to conduct electrical current. While all the solutions that come from organic substances such as sugar cane‚ manosa‚ glucose‚ glycerin‚ ethanol‚ and urea‚ not able to conduct electrical current. Electrolyte solution was divided into two kinds‚ there are: a. Electrolyte strong‚ the solutions that have electrical conductivity big. Strong electrolyte solution in the perfect ionized water. If tested
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Cellular Respiration Project Objective Answers 1. The overall equation for Cellular Respiration is 6O2 + C6H12O6 6H2O + 6CO2 + energy. Overall‚ it is the reverse reaction of photosynthesis‚ but chemically‚ the steps involved are very different. All you have to do is just flip both sides of the equation of photosynthesis‚ and you have the opposite‚ which is the equation for cellular respiration. They are reversible chemical reactions‚ meaning that the products of one process are the exact
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GCE MARKING SCHEME BIOLOGY/HUMAN BIOLOGY (NEW) AS/Advanced JANUARY 2010 INTRODUCTION The marking schemes which follow were those used by WJEC for the January 2010 examination in GCE BIOLOGY/HUMAN BIOLOGY (NEW). They were finalised after detailed discussion at examiners’ conferences by all the examiners involved in the assessment. The conferences were held shortly after the papers were taken so that reference could be made to the full range of candidates’ responses‚ with photocopied
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QUADERNI DI ECONOMIA PER LA COOPERAZIONE ALLO SVILUPPO AGRICOLO TROPICALE - 9 GIACOMO MORELLI EDIBLE OILS IN PAKISTAN AN OVERVIEW WITH A FOCUS ON OLIVE OIL 9 ISTITUTO AGRONOMICO PER L’OLTREMARE GIACOMO MORELLI e work presented is the final delivery of a mission of the author in Pakistan within the project ‘Promotion of the production and marketing of olive oil’. e project has been financed by the Italian Ministry of Foreign Affairs and implemented by IAO (Istituto Agronomico per l’Oltremare
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What is the equation for Fick’s First Law of Diffusion? NET FLUX = PA(delta C) Explain Fick’s First Law of Diffusion. ... 8. In the mock dialysis activity‚ what was the only solute removed from the beaker representing the patient’s blood? UREA Why is it important that this solute be removed
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Diffusion Biology The aim of this investigation is to prove the effect of increasing size on the efficiency of diffusion. Diffusion is the process that cells use to obtain oxygen‚ water and food. Also‚ how they lose waste substances‚ for example‚ urea and carbon dioxide. Basically‚ Diffusion is when particles move from an area of high concentration to an area of low concentration. The surface area to volume ratio of the cell is an important factor in diffusion. It is the effect of this factor that
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comprehension and understanding. Based on the labs you completed‚ answer the following questions: 1. Which solute(s) were able to diffuse into the right beaker from the left beaker? Which did not? Answer: The solute(s) that were able to diffuse Na+/Cl- ‚ Urea‚ Glucose. The solute that didn’t was Albumin. 2. Explain the relationship between the rate of diffusion and the size of the solute. What do you think changes in temperature such as cold/hot would have on the diffusion rate? Answer: The rate
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