Quest 1-2: Describe the fluid mosaic model of plasma membrane structure and list the major components of the membrane. How did scientists discover that the membrane was “fluid”? Explain one experiment that we discussed. • The fluid mosaic model of plasma membrane was the idea that lipids or proteins could move in the membrane laterally. The plasma membrane is made up of a phospholipid bilayer and controls a lot of what goes in and out of the membrane by the organelles from within. The bilayer is considered
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Chapter 6 Resting Membrane Potential (RMP) What is the Resting Membrane Potential (RMP)? ELECTRIC POTENTIAL – separation of opposite charges between 2 points. (“Has the potential to do electrical work if allowed to come together!”) vs. large potential difference small potential difference Magnitude of charge separation = potential difference ** measured in volts (1 Volt
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Outline the roles of membrane at the surface of the cell The plasma membrane encloses the cell‚ defines it boundaries and maintains the essential differences between the cytosol and the extra-cellular environment. The separation of the internal and external environment maintains a constant internal environment which is essential for the cell to function efficiently. Membrane receptors can interact with specific molecules corresponding to stimuli such as hormones to generate a signal cascade which
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occur. 3) Which of the following statements about carrier proteins is FALSE? 3) _______ A) They can become saturated if the maximum transport rate is exceeded. B) They are found integrated into the plasma membrane. C) They assist in simple diffusion. D) They might have to change shape slightly to accommodate a solute. 4) Osmotic pressure is measured in units of _______. 4) _______ A) mm Hg B)
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Abstract The article describes a technique for processing liquid radioactive waste water using membrane techniques to single out only radioactive waste components without affecting the salt ballast. This solution dramatically reduces the amount of radioactive concentrates to be long-term storage‚ and provides an opportunity to re-use treated water and chemicals. Keywords. Liquid radioactive waste‚ radioactive waste water purification‚ reverse osmosis‚ selective extraction of radionuclides. Introduction
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WASTE TREATMENT The treatment is dedicated to finding solutions to agricultural problems by developing alternatives that maintain levels of production while cultivating healthy foods‚ preserving the health of farmers‚ and not polluting surrounding ecosystems. The banana industry creates many by-products that result from the harvesting and processing of bananas. These by-products are banana peels‚ banana stems‚ and liquid wastes. Currently these wastes are dumped in landfills‚ rivers‚ oceans and
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Extra-Corporeal Membrane Oxygenation (ECMO) is a life-saving treatment for severe respiratory failure irresponsive to mechanical ventilation‚ associated or not with haemodynamic instability‚ and its application fields are widening to refractory sepsis and also to elective thoracic procedures. ECMO is replacing conventional cardio-pulmonary by-pass (CPB) even during lung transplantation due to its potential advantages: the absence of full-anticoagulation and the possibility of maintaining the extra-corporeal
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Name: Marion Paxton Diffusion Lab Introduction: In this lab you will observe the diffusion of a substance across a semi permeable membrane. Iodine is a known indicator for starch. An indicator is a substance that chances color in the presence of the substance it indicates. Watch as your teacher demonstrates how iodine changes in the presence of starch. **Prelab Observations: Describe what happened when iodine came into contact with starch. The cornstarch turned blue-black Procedure:
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Evidence for and against the Davson – Danielli model of the membrane structure Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model 1. A lighter area sandwiched in between two darker layers 2. Proteins appear dark in electron micrographs and phospholids appear light. This appearance supports the Davson-Danielli model. 3. Proteins stain darkly‚ suggesting that the dark pattern of the cytoplasm of the red blood cell is the distribution of proteins 4
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student as follows: “Does ethanol concentration affect the activity of bovine catalase?” It is not sufficient for the student merely to restate the research question provided by the teacher. Variables are factors that can be measured and/or controlled. Independent variables are those that are manipulated‚ and the result of this manipulation leads to the measurement of the dependent variable. A controlled variable is one that should be held constant so as not to obscure the effects of the independent variable
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