Osmosis is the movement of water across a membrane. It always navigates to the area of the membrane with a higher solute concentration. We take a closer look at the effects of osmosis in this lab through the examination of red blood cells (sheep)‚ plant cells (elodea)‚ and active transport in yeast. Under the microscope‚ we can determine the effects on plant and animal cells exposed to hypotonic‚ hypertonic‚ and isotonic sodium chloride solutions. Plant cells have a cell wall; however‚ animal cells
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factors were the laws of supply and demand‚ the presence of middlemen‚ and common religions. Under the influence of these factors‚ silk‚ jade‚ dye‚ horses‚ and many other goods were traded throughout Asia‚ Africa‚ and Europe. Not only did these factors increase trade‚ but it also helped spread ideas and culture across the world. This cultural diffusion led to new languages and literatures. Through a globalized trading network across Asia‚ Africa‚ and Europe‚ new goods and ideas spread across the
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this diagram‚ which shows a cross-section through a leaf‚ to answer questions 14 and 15. 14 Which cell type absorbs the most carbon dioxide during the day? 15 A leafy shoot is placed in a solution of red dye. After 30 minutes‚ which part of a leaf from this shoot will contain the red dye? 16 The diagram shows cross-sections of three types of blood vessel (not drawn to the same scale). What is the identity of the three vessels? X Y Z A B C D artery capillary vein A X Respiration is
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membrane structure Introduction Beetroot Pigments Beetroots contain Betalains which are the red pigments present in the cell vacuole. Betalains are soluble in water and they contain nitrogen. Betalains extracted from beetroot is commonly used as food dye because it is not known to cause any allergic reactions. Beetroot Picture taken from http://tipdeck/how-to-cook-beet-root Structure of Betalain Picture taken from http://en.wikipedia.org/wiki/File:Betanin.png Cell Membrane Cell membrane
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Cockroaches and Hemolymph Concentration in the Body Abstract This lab was conducted to determine the concentration of hemolymph in the body of a cockroach. It was done by making serial dilutions to make a standard graph by injecting a dye into a cockroach and determining the concentration at different times with the use of a spectrophotometer to find the optical density which is measured in absorbance. Results showed that the concentration was not within the pre-experiment research range
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they too do not require an active role for the membrane. Osmosis is movement of water across a semipermeable membrane of low concentration to a solution of high concentration. On the other hand diffusion is movement of molecules from a high concentration to a low concentration. Osmosis is a form of diffusion but a distinction would be that it deals essentially with water. Tonicity is what makes the cells either shrink or grow depending on the environment it is placed at‚ it is an osmotic pressure and
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will be a change in the rate of colour leakage. Scientific Background Beetroot is a very familiar vegetable and is commonly known as beet. It is famous in most recipe books that advice that its outer skin is not to be removed to avoid getting red dye in the cooking water. If we look at the internal structure of beetroot‚ it will be observed that it consists of cells which are surrounded by a cell membrane. This cell membrane structure separates the contents of the cell from outside. The membrane
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To do this successfully I will need to alter the surface area of the beetroot cells accurately and then measure if any and how much dye is let out. I can hopefully then look at my results and then find a relationship between the two factors and be able to explain exactly why any changes took place. PREDICTION For this experiment I would expect the leakage of dye to increase as the surface area increases and this is based on the knowledge of the formation of membranes. Membranes are made of two
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pg.2 WATER FLOW ACROSS CELL MEMBRANES The movement of water across semi-permeable membranes as it relates to the laws of thermodynamics and energy flow with the diffusion of molecules down a concentration gradient of various solute concentrations‚ observing microscopically viewed outcomes‚ and spectrophotometrically measured results. ABSTRACT This experiment will identify the movement and exchange of water through
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Table of Contents Summary………………………………………………………………………………….…2 Objective……………………………………………………………………………….…….2 Data‚ Observations and Results……………………………………………………………2 Discussions…………………………………………………………………………………..4 Conclusion……………….………………………………………………………………….6 References………………………………………………………………..…………………6 Appendices Summary The name of the equipment used for this experiment is TecQuipment Reynolds Number and Transitional Flow Apparatus‚ H215/215A TecQuiment Hydraulic Bench‚ H1. This
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