Osmosis is the diffusion of water across a semipermeable membrane. It occurs because of the concentration of a solute in a solution. In a hypertonic solution the concentration of the solute is higher and water is moved into the cell through osmosis‚ but in a hypotonic solution the concentration of the solute is lower and water is moved out of the cell. In an isotonic solution the concentration is the same in and out of the cell‚ and water moves in and out evenly. In facilitated diffusion carrier proteins
Free Concentration Cell membrane Osmosis
program DNA 20. Golgi Apparatus- a membranous structure in the cytoplasm of cells consisting of layers of flattened sacs and functioning in the processing and transporting of proteins 21. Hypertonic solution- a solution in which water molecules are moving out of a cell‚ causing it to shrink 22. Hypotonic solution- A solution in which water molecules are moving into the cell‚ causing it to swell 23.
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Natalie Salaverria 01/21/11 LAB EXERCISE I After the first exercise : Simulating Simple diffusion Which Materials diffused from the left beaker to the right beaker? NaCl ‚ Urea ‚ Glucose Which did not ? Albumin Why ? Albumin’s Composition or charge was too great to diffuse through the membrane. After the 2nd activity : Simulating Dialysis What happens to the urea concentration in the left beaker (the Patient)? It diffused to the right beaker Why does this occur? The excess
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the body’s filtered water is reabsorbed here dips into the medullar where there is a high concentration of NaCl‚ this creates a large vertical concentration gradient. It is this that allows the body to maintain water in hypertonic environments and remove excess water in hypotonic environments. (Sherwood‚ et al.‚ 2012). This allows the mammalian body to regulate the concentration of their urine in order to maintain internal homeostasis. DESERT ANIMALS
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salinity of solutions has on the process of osmosis and net weight gain/ loss by potato cells. This would be done by using similar size potato cubes and covering them with different concentrations of saline solutions (0.5% and 2.0%) in beakers then measuring the change in weight of the potato cubes. If the salinity of the solution is high then the weight of the potato cubes will decrease. Materials • 9 X 2cm2 potato cubes • 3 X
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Osmosis Experiment Dennis M. Feliciano Grand Canyon University BIO100L Biology Concepts Lab June 25‚ 2011 Osmosis Experiment Materials Grapes (unblemished) Raisins (larger is better) Water Salt Four small containers (i.e.‚ drinking cups or clear glasses) A metric ruler Methods and Procedure Place 1 cup (236 ml) of water in each of the 4 containers. In 2 of the containers‚ add 1 tablespoon (14.8 ml) of table salt and mix well. Measure the length and width of a raisin and place
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cell membrane‚ which is a semi-permeable‚ meaning that only some things and not others can pass through it (Purchon‚ N‚ 2000). If there is a higher concentration on the outside of the cell than on the inside of the cell then it is referred to as hypotonic. When this happens‚ water flows from outside the cell into it‚ and the cell starts to swell. When the cell swells it is said to be turgid‚ which means swollen and hard (Etomica‚ 2010). In plant cells there is a cell wall which prevents these cells
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Bio 115 Exam 1 Study Guide These topics will be on the exam. ▪ What are the tenets of cell theory? • Cells are the basic structural and physiological units of all living organisms. • Cells are both distinct entities and building blocks of more complex organisms. OR • All living organisms are composed of one or more cells‚ Cells are the basic units of structure and function in an organism‚ and Cells come only from the reproduction of existing
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Chapter 1 - Scientific Methods Objectives 1. Demonstrate a basic knowledge of classroom/science safety. 2. Understand the purpose of a hypothesis‚ and identify when a hypothesis should be used. 3. Be able to identify the independent and dependent variables in a formalized hypothesis. 4. Differentiate between an observation and an inference. 5. Contrast quantitative and qualitative observations. 6. Given a data table‚ draw and label a graph. Including a title‚ labeled units‚ and legend. 7
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diversity Why are cells small? Prokaryotic vs eukaryotic cells Plant vs animal cells- organelle function and location Cell membrane structure and function Diffusion‚ facilitated diffusion‚ active transport‚ endocytosis‚ exocytosis Osmosis- hypertonic‚ hypotonic‚ isotonic environments Unit 4- Cellular Energy (ch. 8) Laws of Thermodynamics Metabolism- Anabolism vs catabolism Formation of ATP Photosynthesis Chemical Equation Structure of a chloroplast Chlorophyll a vs accessory pigments Light dependent reaction-
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