the size of their cells. The information in the table shows that as an organism gets larger in size‚ its surface area to volume ratio will decrease. However‚ the smaller the organism is‚ the greater its surface area to volume ratio will be. A small uncellular organism would have a large surface area in which diffusion (the movement of molecules) can take place. Diffusion is essential in order to supply oxygen and get rid of carbon dioxide across the outer cell surface membrane. However‚ as an organism
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BRIEF INTRODUCTION: Beetroot cells contain a red pigment stored in the cell vacuole in the membrane to prevent leaking out from the cell. In this experiment we used several solvents to calculate which one made the cell release more pigment. RESULTS: A table showing the results of the intensity of the color and the absorbance of the liquids with the different solvents. Solvent Results from colorimeter 0.001 Acid (Hydrochloric) 0.358 Ethanol 0.132 Hot water 0.984 Cold water-distilled
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Write-up Part 1- Purpose: Why did we do the experiment? The purpose of this experiment was to understand how osmosis works and that the cell membrane is selectively permeable. Osmosis is the diffusion of water molecules through a selectively permeable membrane. Many cells cannot function without adequate water‚ so cells depend on osmosis. When a cell is selectively permeable‚ it means some substances can pass through while others can’t. Many examples of these were shown throughout the experiment
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a typical cell‚ the concentration of K+ is about 5mM and the concentration of Na+ is about 150 mM. When you increase the concentration of K+ from 5 to 25 mM and reduce concentration of Na+ from 150 to 130 mM‚ the outside has more concentration of K+. The membrane is permeable to a particular ion‚ that ion will diffuse down its concentration gradient from a region of higher concentration to a region of lower concentration. 2. Explain why increasing extracellular K+ causes the membrane potential to
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Formed by cells and molecules of the extracellular matrix o Connective tissue: characterized by the abundance of extracellular fluid o Organs can be divided by parenchyma (composed of cells for main function of organ) and stroma ( supporting tissue) o Except in brain and spinal cord stroma made of connective tissue o Epithelial tissue: covering‚ lining protecting surfaces ex: skin‚ absorption (intestines)‚ secretion (epithelial cells of glands)‚ contractility (myoepithelial cells) o Characteristic
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Diffusion and Osmosis NGSSS: SC.912.L.14.2 Relate structure to function for the components of plant and animal cells. Explain the role of cell membranes as a highly selective barrier (passive and active transport). SC.912.L.14.3 Compare and contrast the general structures of plant and animal cells. Compare and contrast the general structures of prokaryotic and eukaryotic cells. AA Background: (Source: www.explorelearning.com) Diffusion is the process in which there is a net movement of molecules
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Laboratory Report The Plasma Membrane I. Introduction The Plasma membrane is the edge of life‚ the boundary that separates the cell from its surroundings. It controls the traffic of materials in and out of the cell. (Reece‚ 2011). It is incredibly thin that is very vital in maintaining the integrity of the cell. Not only does the plasma membrane bind the other organelles‚ it also forms a dynamic structure which gives them their remarkable activity and selectivity. (Hickman‚ 2008). Diffusion
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Chemotaxis‚ the guided movement of cells by chemical gradients created by chemoattractant proteins‚ such as chemokines and bacterial products produced at the site of inflammation‚ probably emerged early in eukaryotic evolution {Kay‚ 2008 #3289}. Neutrophils are highly mobile cells that readily undergo chemotaxis. Neutrophils can detect as low as 1/100th of a chemokine gradient. They polarize their migration towards bacterial peptides over a pool of other chemical gradients to reach sites of inflammation
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1. Cells structure and Organisation 1.1 Plant Cells and Animal Cells: Fig.1.0 Basic structures of an animal cell and a plant cell. 1. • • • Cell wall: Porous. Permeable. Non-living structure made of cellulose. 2. Cell membrane/Plasma membrane • Semi-permeable/Partially permeable(Only certain parts can pass through it and some aren’t able). 3. • • • Cytoplasm Contains cell organelles. Food substances. Mostly H2O. 4. Vacuole/Sap vacuole/Large central vacuole • Mostly H2O. 5. Nucleus •
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Kramas Cells and Heredity Lab Tuesday 2:00-4:50 22 OCTOBER 2012 Membrane Permeability Decreases as Molecular Size Increases Introduction: Red blood cells are vital to organisms functioning properly. They are microscopic cells that carry oxygen from the lungs to all the tissues throughout the body. Upon transporting oxygen‚ red blood cells also exports waste‚ such as carbon dioxide‚ to the lungs where it can be expelled. Red blood cells are made up of hemoglobin which is surrounded by a cell membrane
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