BioLab3 Cell Membranes Lab Report Student Name: I. Diffusion Define the following terms. Solvent Solute Solution. Diffusion Concentration gradient Dynamic equilibrium EXERCISE 1 – Factors influencing rate of diffusion Predict how molecule size and temperature will affect the outcome of this experiment. Record the data from the information in the lab. Potassium Permanganate R.T. Methylene Blue R.T. Time (min) Total Diameter
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1 Experiment Membrane Transport Objectives ► Referring to energy‚ what two ways can substances enter a cell? What is active transport? What is passive transport? How is osmosis related to diffusion? How can we demonstrate active transport? How can we demonstrate Brownian movement? How can we demonstrate diffusion (2 ways)? How can we demonstrate osmosis (3 ways)? In terms of relationships between substances‚ how can we define “hypertonic”‚ “isotonic”‚ and “hypotonic”? What is the relationship
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The plasma membrane of a cell is extremely important to the transportation of substances into and out of the cell. The outer membrane of a cell is made up of lipids and proteins. Most of the lipids in plasma membranes are phospholipids. The phospholipids have a hydrophilic head and two hydrophobic tails. When engulfed in water‚ they arrange themselves such that all the hydrophobic tails clump together‚ surrounded by the hydrophilic heads‚ protecting the tails from the exposure to the water. In cells
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the market everyone experiences the same thought: “Organic or regular?” If one does decide to go organic‚ a few things come to mind: Is organic worth the price? How do I know if it really is organic? Why should I buy the organic five-dollar raspberries‚ while the normal raspberries are only two dollars? These are thoughts that strike every one’s minds while shopping at their local super market. The majority of people would turn away from organic products due to the price. Not only is the price a
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Supercritical Carbon Dioxide as a Green Solvent Gregory Absillis June 2009 The majority of chemical processes in chemical synthesis are carried out in solution and organic solvents usually are the first choice. To satisfy this demand‚ 15 billion kilograms of organic are produced worldwide each year. [1] These solvents often bear considerable risk due to their toxicity‚ flammability or environmental hazards. Furthermore‚ they have to be separated from the products and recycled or disposed at
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Definition of Ecopreneurship The term “ecopreneur” is derived from two terms which are “entrepreneur” and “ecology. An entrepreneur is a person who undertakes innovations‚ finance and business acumen in an effort to transform innovations into economic goods and who accepts the risks associated with them. (Schaper‚ Michael.2002) He can be anyone who identifies an opportunity in a market and has a belief that it would succeed in the economy and on that belief he starts exploiting the opportunity
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How Stress Effects Cancer Survival John Steinbeck once wrote "A sad soul can kill you quicker‚ far quicker‚ than a germ” Having a condition like cancer can cause great stress. Having cancer tends to raise anxiety along with over whelming stress believe it or not this can affect the survival of the diagnosed person. Recent studies have shown that a person with illnesses like cancer that can combat stress have a higher survival rate than those who don’t deal with stress well. Learning to deal with
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Causes and Effects of Stress in Daily Life Stress is a big part of life of many people around the world ‚ including Saudi people . Nowadays ‚ Everyone suffers from stress some point in their day. They would get irritated very easily. They would feel anxious and unable to concentrate on their work . The causes of stress are enormous and everyone in the society deals with it regardless of their age .Stress is very serious condition .It can cause fatigue‚ headaches‚ and back pain . Constant
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THE CAUSES AND EFFECT OF STRESS AMONG STUDENT College and school is a new and exciting time‚ but it can be overwhelming. Among all of the new experiences‚ and learning and growing opportunities available in a college or school environment‚ many may lead to unhealthy levels of stress which hinder student abilities to socialize and to achieve their academic goals. Recognizing the sources of stress is important in preventing it from becoming unmanageable or debilitating. Relationship also can be
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does not need to be generated. Diffusion is complete when the concentration of molecules is equal on either side of the membrane. Diffusion rate can be influenced by many factors such as: Concentration gradient across the the membrane. Permeability of the membrane to the diffusing substance. Temperature. Surface area of the membrane. Question 2 2.1 Acetylcholine is an organic chemical that functions in the brain and body as a neurotransmitter it is an ester of acetic acid and choline. Acetylcholine
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