1a) In a positive test for sugar‚ one would see the colour of the substance change from blue to light green to greenish yellow to orange and lastly reddish brown. b) In a positive test for starch the colour of the substance would change to black c) In a positive test for protein the colour of the substance would be pink or purple/violet d) In a positive test for lipids the substance would leave a translucent stain on the brown paper bag 2. The purpose of testing the four test tubes was to ensure
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Describe how the uses of plant fibres and starch may contribute to sustainability How can plant fibres be used? First of all the plant fibres have to be extracted from the plant itself. The process of extraction often used is called retting. Retting involves using water or micro-organisms to dissolve or rot away the cellular tissues surrounding the bast-fibre bundles. Afterwards the fibres are obtained; usually they extract very long sclerenchyma cells and xylem tissue because of their good
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Back Laboratory Program SAFETY IN THE CHEMISTRY LABORATORY 786 Pre-Lab Extraction and Filtration 790 1-1 Mixture Separation 792 1-2 Water Purification 794 3-1 Conservation of Mass 798 4-1 Flame Tests 801 Pre-Lab Gravimetric Analysis 828 13-1 Separation of Pen Inks by Paper Chromatography 830 13-2 Colorimetry and Molarity 834 14-1 Testing Water 838 804 7-1 Separation of Salts by Fractional Crystallization 806 7-2 Naming Ionic
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was positive‚ meaning K. pneumoniae produces urease to break down urea. An inoculation onto Kligler’s iron agar determines if an organism can ferment glucose and lactose‚ it also detects the production of hydrogen sulfide from the breakdown of cysteine. Our Kligler’s iron agar showed acid with gas production‚ meaning K. pneumoniae fermented both glucose and lactose. The hydrogen sulfide production was negative. A Litmus Milk test is done to determine whether the organism can ferment lactose‚ digest
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hydrolysis of Starch Abstract This experiment consisted of setting up a control group of starch in various temperature and then placing both fungal amylases and bacterial amylases in a mixture of starch and placing the solution of amylase and starch in various temperatures of water. After a certain amount of time- different amount of time needs to be used in order to have reliable results- iodine is added in a well on spot plates‚ then two drops of the mixture of amylase-starch is added from
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presence of some of these‚ such as sugar‚ fat‚ starch‚ and protein‚ can be determined using tests such as Benedict’s solution‚ Lugol’s iodine solution‚ Biuret’s reagent‚ and Sudan III. Control tests were performed to determine what a positive result would appear like. Then the tests were performed using substances containing sprite‚ fries‚ hamburgers‚ and chicken nuggets. Results matching the control results would establish how much protein‚ fat‚ starch‚ and sugar there was in each mixture. Introduction
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experiment includes a bioreactor unit‚ a benchtop shaker unit‚ a spectrophotometer‚ flasks‚ graduated cylinders‚ cuvettes‚ micropipettes and tips‚ aluminum foil‚ and autoclave tape. Figure 2 displays some of these. Before the experiment began‚ the lab equipment was cleaned and sterilized. The bioreactor was disassembled and all equipment was rinsed thoroughly. Then‚ aluminum foil and autoclave tape was used to cover all openings in the equipment. After all the equipment had been cleaned and all the
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Balloon Respiration Lab Introduction/ Background Cellular respiration is a process that releases chemical energy from glucose and other carbon-based molecules to produce ATP when oxygen is present. The formula for cellular respiration is C6H12O6+ 6O2= 6CO2= 6H2O. The process of respiration contains three main parts‚ glycolysis‚ Krebs cycle‚ and the Electron Transport Chain. The process of glycolysis takes place in the cytoplasm and is considered an anaerobic process which splits glucose into two three-carbon
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Ellice Johnson Period 1 October 12‚ 2012 Diffusion and Osmosis Shown In Solutions Section 1: Abstract This lab‚ title Diffusion and Osmosis‚ was centered around the diffusion across a cellular membrane and how exactly materials move and diffuse in concentrations. Both diffusion and osmosis are forms of movement that are part of passive transport dealing with cell membranes. Diffusion is where the solutes move from an area of high concentration to a low concentration. Water goes through the cell
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Osmosis Lab Introduction: In order for cells to interact with their environment‚ molecules must be able to move through the cell membrane. Movement within the cell occurs by diffusion. Molecules move through the cell membrane by osmosis. Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration. This happens because of random molecular motion. Molecules move around randomly until there is an even mixture throughout cell and mixture. The overall
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