The Cell membrane surrounds all living cells and is the most important organelle‚ there is also a similar plasma membrane that surrounds all the organelles except for the ribosome. The membrane controls how and what substances can move in and out of the cell/organelle The structure of the membrane is often referred to as the “Fluid Mosaic Model”; this is because of the way it is structured It is composed of phospholipids‚ proteins‚ and carbohydrates‚ which are arranged in a fluid
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Introduction The purpose of this experiment was to demonstrate osmosis. Osmosis is the diffusion of water across a selectively permeable membrane (Bell et al 2004). Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration (Brown 1999). Hypertonic is the solution with a higher salt concentration. Hypotonic solution is the solution with the lower salt concentration. My hypothesis is that the potato core will increase in size. When the solution is
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Diffusion and Osmosis lab Results: Figure 1a-rate of weight change in 15 min intervals of each concentration. The first tube showed very little weight change. However all other tubes show a greater change the concentration could be the factor that determines the permeability of the sucrose. The sucrose molecules are too large to pass through. Figure 1b- sucrose concentration determines the weight change. In this case based on our results as concentration increases the percent weight change
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three main parts of a cell. plasma membrane-forms a cell’s flexible outer surface‚ separating the cell’s internal environment (inside the cell) from its external environment (outside the cell) cytoplasm- consists of all the cellular contents between the plasma membrane and the nucleus. nucleus- is the largest organelle of a cell. The nucleus acts as the control center for a cell because it contains the genes‚ which control cellular structure and most cellular activities The cell is the basic‚ living
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The Blood Circulatory System The Circulatory system is a system in the bodies of all organisms that moves the nutrients that are needed as well as gases and wastes to and from cells and helps fight unwanted bacteria and other diseases. It also helps alleviate the body temperature to maintain homeostasis‚ which is the property of either an open system or a closed system in a living organism. It brings the body’s cells what they need in order to survive – oxygen and nutrients. The center of the circulatory
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Desalination of Seawater Project Paper The main concept of this Desalination process is reverse osmosis‚ but we will get into that later. Right now what is probably running through your head is what exactly is desalination. To put it simply desalination is the process to make seawater or otherwise undrinkable water safe to consume. This can be accomplished through a variety of methods such as the simplest but one of the ones that requires a lot of money would be distillation. Distillation is commonly
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Cell: The cell is the basic structural‚ functional and biological unit of all known living organisms. Cells are the smallest unit of life that is classified as a living thing‚ and are often called the "building blocks of life". Discoverer: The cell was discovered by Robert Hooke in 1665. The cell theory‚ first developed in 1839 by Matthias Jakob Schleiden andTheodor Schwann‚ states that all organisms are composed of one or more cells‚ that all cells come from preexisting cells‚ that vital functions
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Determining the Rate of Osmosis with Water and Sucrose 10/3/2012 Determining the Rate of Osmosis with Water and Sucrose Author: Results: Bag 1 had a rate of osmosis equal to 0.01 grams per minute. Bag 2 had a rate of osmosis equal to 0.0543 grams per minute. Bag 3 had a rate of osmosis equal to 0.0471 grams per minute. Bag 4 had a rate of osmosis equal to 0.0886 grams per minute. Bag 5 had a rate of osmosis equal to -0.0914 grams per minute (Figure A). Figure A: Shifting of mass
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1. Running Heading: BLOOD DISORDERS Blood Disorders Athena Hackett Health and Diseases: Understanding Paths and Pathology June 20‚ 2010 Dr. Natasha Billups In each scenario provided each person is at risk of a specific disorder. The first patient Amy‚ who is the four year old Caucasian female‚ in my opinion is at risk for the blood disorder of Iron Deficiency Anemia. Next is person at possible risk of a specific blood disorder is Marcus. Marcus is a five year old African American
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following statements is true? A. Blood is an organ B. Blood is a connective tissue X C. Blood is composed of living cells only D. None of the above 2. Which of the following would be considered a normal hematocrit? A. 45% X B. 35% C. 85% D. 10% 3. Which of the following cells does not contain a nucleus? A. Monocytes B. Lymphocytes C. Erthyrocytes X D. All of the above 4. Which of the following is a function of blood? A. Distribution of gases‚ wastes
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