AFFECTS OF DIFFERENT SUCROSE SOLUTIONS ON OSMOSIS OF EGG MEMBRANES A laboratory report submitted for LE@D Biology 1004 Michele Liveley Arkansas State University Mountain Home Mountain Home‚ AR September 2013 Osmosis Egg Lab Report Introduction Osmosis is the passing of water or other solutions from an area of high concentration of particles to an area of less concentration. The cell membrane is an organelle‚ selectively permeable‚ and only allows
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outermost plasma membrane genetic material in the form of DNA cytoplasm with ribosomes 1. Plasma Membrane • All membranes are phospholipid bilayers with embedded proteins • The outer plasma membrane isolates cell contents controls what gets in and out of the cell receives signals 2. Genetic material in the form of DNA Prokaryotes – no membrane around the DNA Eukaryotes – DNA is within a membrane 3. Cytoplasm with ribosomes Cytoplasm – fluid area inside outer plasma membrane
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fluid-mosaic model of a plasma membrane. Discuss the role of the membrane in the movement of materials through each of the following processes: a.) Active Transport b.) Passive Transport All living cells contain a plasma membrane‚ which acts a boundary for the cell. The plasma membrane regulates the cell’s chemical composition because it uses selective permeability to allow certain substances to enter or exit the cell more easily than others. The formation of this membrane is believed to be one
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Joseph’s Story Jalisa Cason A&P 1 Unit 2 case study B. Cellular processes and membrane functions that will be affected if Joseph’s heart stopped would be as follows. Oxygen‚ glucose‚ and essential ions that are required for the heart to pump will slow down. Each of his cells will have to work harder and faster which uses up his energy supply. Carbon dioxide levels inside the cells will rise‚ which causes his PH to drop. The mitochondria will run out of oxygen and glucose to make essential ATP
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Biology 2020 Microbiology Study Guide for first exam The history and scope of microbiology 1) What are the organisms/entities of study in the field of microbiology? * Bacteria * Archaea * Eukarya * Viruses and Prions (Acellular entities) 2) Who was the first human to publish extensive descriptions of microorganisms? * Antony van Leeuwenhoek 3) How did Louis Pasteur dismantle the theory of spontaneous generation in bacteria? * Swan neck flask experiment: Flask
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Chapter 5 Membrane Structure and Function Winter wheat is planted in the early fall‚ grows over the winter when the weather is colder‚ and is harvested in the spring. As the temperature drops from fall to winter‚ the makeup of the plasma membrane of winter wheat changes. Unsaturated fatty acids replace saturated fatty acids in the phospholipids of the membrane. Why would colder weather select for the different lipid makeup in the plasma membrane? An abstract in the Canadian Journal of Botany
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Cell Membrane Simple diffusion is when a small‚ non-polar molecule passes through a lipid bilayer. It is classified as a means of passive transport. In simple diffusion‚ a hydrophobic molecule can move into the hydrophobic region of the membrane without getting rejected. Simple diffusion does not involve a protein. An example of simple diffusion is osmosis. Hydrophilic molecules cannot participate in simple diffusion because they would move into the hydrophobic region of the membrane and be
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Starch/Amylase Experiment Report Objective: The purpose of the starch/amylase experiment was to simulate and observe the process of enzyme digestion. Materials: * 1 small beaker * 2 large beakers * 2 cut pieces of soaked dialysis tubing * 2 dialysis tubing clamps or pieces of twine * 2 clean plastic pipettes * 1 bottle of Lugol’s solution * 2 glucose test strips Procedure: Begin the experiment by placing 4 full pipettes worth of cooked starch in a beaker. Then‚ use
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Cellular boundary plasma membrane Cell wall ridgidity‚ cellular protection peptidoglycan; composed of carbohydrates and peptides plants‚ ridgidity‚ cellular protection (not in animal cells) cellulose‚ carbohydrates DIFFERENCES Prokaryotes Eukaryotes size Small‚ few microns Large‚ average cell is 5-20 m‚ frog egg is 1mm ~10 times the length ~1000 times the volume nuclear region nucleoid‚ poorly demarcated region of the cell where the DNA is located not bounded by membrane nucleus‚ bounded
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Eukariotic Cell Structure: Boundaries and Control: Plasma Membrane - The plasma membrane is sometimes called the cell membrane‚ or the cellular membrane. It is the outermost part of the animal cell‚ and it’s purpose is to enclose the cell‚ and change shape if needed. The cell membrane is capable of allowing materials to enter and exit the cell. Oxygen and nutrients enter‚ and waste products such as excess water leave. The plasma membrane helps maintain a chemical balance within the cell. Cell
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