• enzymes
    partially degrade starch into simple disaccharide sugars (maltose), smaller polysaccharides (dextrin), and simple sugars (glucose). None of these products give a positive iodine test, but starch does. Students will prepare an enzyme solution and test its ability to break down starch. Background Information ...
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  • Enzymes
    known as salivary amylase (Karp, 2008). The substrate for salivary amylase is starch, a polysaccharide composed of amylose and amylopectin (Cohen, 2007). Salivary amylase acts by 2 catalyzing the breakdown of starch into smaller polysaccharides and a disaccharide formed from two glucose molecules...
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  • Good Stuff
    Experiment 1. The test for starch (a) Label four test-tubes 1-4. 10% glucose solution into tube 1 1% starch solution into tube 2 (b) Put about 20 mm (depth) of ...
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  • project on chemistry : study of digestion of starch by salivary amylase
    “To Study the digestion of starch by salivary amylase and effect of temperature and pH on it” and To study digestion of starch by saliva. To study the effect of temperature on the digestion of starch by saliva. To study the effect of pH on the salivary digestion of starch. Introduction Every...
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  • The Effects of Substrate Concentration, Reaction Time and Enzyme Concentration on Enzyme Reactions
    in both the saliva and the small intestine. Salivary amylase is a hydrolytic reaction that breaks down starch molecules by systematically breaking off the maltose molecules from the ends of starch chains. The maltose is further broken down by another enzyme. Phosphorylase is an enzyme that systematically...
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  • Iodine Test for Starch
    Iodine Test for Starch Introduction and Hypothesis: In this experiment, we used iodine to test for starch in certain solutions. Iodine separates starch from polysaccharides, monosaccharides, and disaccharides. Starch is a curled polymer of glucose and iodine interacts with molecules, which changes the...
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  • Mrrrrrrrrrrrr
    amylase breaks down the polysaccharide, AKA starch, into the monosaccharide, glucose. In this experiment, Iodine solution will be used to test for the presence of polysaccharides in test tubes. The basic principle of this iodine test is that when an iodine solution (i.e. aqueous solution of potassium...
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  • carbohydrates
    Practical “Effect of salivary amylase on starch” ____________________________________________________ “Salivary amylase” is a digestive enzyme secreted by the salivary glands. It is responsible for starting the breakdown of the insoluble polysaccharide “starch” into soluble dextrins (oligosaccharides)...
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  • Experiment Biology
    Responding : Colour of solution c) Fixed : Temperature and time Materials : Iodine solution, Benedict’s solution, 1% starch suspension, 30% glucose solution and distilled water Apparatus : A Visking tube, cotton thread, test tubes, beaker and water bath Procedure - Soak the Visking tube in water...
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  • Carbohydrates
    three or more monosaccharides or monomer are involved in a condensation synthesis a polymer or polysaccharide is formed with a by product of water. Starch and Glycogen are two common chain polymers.<br><br>Just as the removal of water joins carbohydrates together via condensation synthesis, hydrolysis...
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  • Diffusion and the Effect of Amylase
    solution. We will analyze reactions in different pH ranges. The starch solution will appear blue when mixed with iodine. But after mixing the enzyme amylase to the starch, the starches are broken down into simple sugars. Now, when the iodine is added, no color change exist. Instruments and materials...
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  • yellow bananas
    bananas? Hypothesis: Yellow bananas are sweeter than green bananas because some starch is converted into reducing sugar during ripening. Aim: To prove the hypothesis by comparing the amount of reducing sugar and starch in bananas of different degree of ripeness. Principle: Extraction of chemicals...
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  • Diffusion Across Biological Membranes: a Simulation
    distilled H2O, starch, iodine and glucose in tied dialysis tubing to test for substance which diffuse through the membrane and which one could not due to its size. Materials and Methods Materials: * Distilled H2O * Starch solution * Iodine solution * Glucose solution * Test tube (3-4/group) ...
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  • IB HL BIO DIalysis Lab
    contains waste matter that flows from the blood our of the dialysis tubing. Question/aim of lab: To test the solutions inside and outside the dialysis tubing with Benedict’s solution, Iodine reagent and silver nitrate solution to find out what has remained in the dialysis tubing, and which solutes...
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  • Saliva on Starch
    Experiment 9. The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep...
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  • Biology Open-Ended Investigation
    In the presence of starch iodine turns blue/black in the temperatures of 0 C and 100 C (sometimes present in 37 C temperatures) and if no starch is present it is a pale yellowy-brown colour.  Iodine can therefore be used to monitor the breakdown of starch into sugar.  When the iodine no longer changes...
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  • Amylase vs Starch vs Temp vs Buffers Lab Report
    Amylase Enzyme vs. Starch vs. pH vs. Temperature Taylor Ellsworth Professor Michael Bunch Cell Biology 112 “Effects of Amylase reaction time when breaking down starch.” Experiment Goal: The goal of our experiment was to understand the similarities in digestion by finding out how long it takes...
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  • Biology Photosynthesis Lab
    Biology lab AIM: To test a leaf for starch APPARATUS/MATERIALS : * bunsen burner, tripod stand, wire gauze(OR 90oC electric water bath OR hot plate) * 250 cm3 beaker * boiling tube * anti- bumping granules * forceps * test tube holder * white tile * leaf to be tested...
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  • Test for starch
    Testing for the Presence of Starches, and Proteins Purpose: To test for the presence of starches and protein macromolecules, to introduce the concept of variations in chemical compounds. Hypothesis: If biuret is blue after a test for protein, then it is a negative result because biuret reagent is...
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  • Isolation of Macromolecules
    Introduction Utilizing three tests, the Iodine Test, Benedict’s test, and the Biuret Test, we will test for starch and glycogen, simple sugars and proteins respectively. Iodine Test The iodine test utilizes iodine as a stain. We will add iodine to 11 known liquids, and one unknown liquid...
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