4 given samples A‚ B‚ C and D. Research Question: Out of the four given samples which sample consists of protein/ starch/reducing sugar/ disaccharide? What color changes will help to identify the contents of each sample when treated with iodine‚ biuret agent and benedicts solution? Theory and background information: What is a protein?1 Proteins are macromolecules‚ consisting of one or more chains of amino acid residues. Proteins perform a vast array of functions within living organisms‚ including
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solution‚ 5% -Known foods; glucose‚ corn starch -Cornstarch suspension‚5% -Detergent solution -Unknown food samples -Benedict’s reagent -Lugol’s solution -Sudan IV indicator -Unglazed brown paper -Gelatine solution‚ 5% -Biuret reagent Procedure: 1. Safety goggles and lab apron were put on. Part A: Carbohydrate Test 2. Poured 300 mL of water into a 400 mL beaker. Secured the beaker with a ring clamp‚ placed it on a hot plate‚ and heated the water to 80 °C
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record their results. 7. Have students return to their desks but stay with their groups to complete the Analysis Questions in their journals. Alternate indicators: Iodine for lipids/oil (turns pink but transformation is temporary so watch carefully) Biuret Solution is easy to make. Start with 40% NaOH and
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Identifying Organic Compounds 2. Purpose/Problem: I am doing this experiment to find out what kind of organic compounds are in test tubes A‚ B‚ C and D. I am curious to know if substance D was the lipid because it seemed thin and had a slightly yellow tint of color to it. 3. Research: In my research I was informed about facts and appearances of lipids. First of all lipids are non-polar compounds‚ thus they won’t dissolve in water. This is also known as being hydrophobic. They are made with one
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experiment the detective compares the unknown’s response to the experimental procedure with the control’s response to that same procedure. Controls are important because they reveal the specificity of a particular test . A positive control contains the variable for which you are testing. It produces a positive reaction and demonstrates the
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Why was the water tested for each of the initial chemical tests? The water was tested for each initial chemical test because it served as the controlled variable. Since water is pure oxygen and hydrogen unlike Glucose and Starch‚ one variable may be observed. 2. Biuret reagent will turn your skin brownish-purple. Explain why this occurs. Biuret reagent will turn your skin a brownish-purple because Iodine detects protein in a substance by changing the color to a brown or purple shade‚ and since
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starch protein d. Biuret test - glucose tap water oil (lipid)) starch protein 7. All proteins contain carbon‚ hydrogen‚ oxygen and what other element? Nitrogen 8. When one glycerol molecule covalently bonds via dehydration synthesis with three fatty acid molecules the resulting macromolecule is called a __lipid_________. 9. What are the two general categories of carbohydrates? Starch and cellulose ID the test: Sudan IV‚ Benedict’s‚ Biuret‚ Starch 10. The
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Cell Membrane Transport ZOOL 2011.19 A. Introduction: Cells are the most significant building blocks of all living things. They are also the tiniest living organisms in the human body which provides structure for the body and intake nutrients that become energy. Cell membranes control what goes in and out the cell‚ it protects it. The lipid bilayer describes the membrane of both animal and plant cells where the properties that make up phospholipids are very important
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Running Head: GVT Task 2 GVT Task 2 Maureen O’Connor Western Governors University The mouth‚ pharynx‚ esophagus‚ stomach‚ small intestine consisting of the duodenum‚ jejunum‚ ileum‚ and large intestine consisting of the transverse colon‚ descending colon‚ ascending colon‚ cecum‚ sigmoid colon‚ rectum‚ vermiform appendix and anus are all part of the alimentary canal. The function of the alimentary canal is to provide nourishment. The teeth‚ tongue‚ gallbladder‚ salivary glands
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The use of positive and negative controls to determine the macromolecules present in an unknown solution Course # 6130‚ Wednesday‚ 7-10 PM‚ B2-151 Lab performed: September 21st‚ 2011 INTRODUCTION Every living thing is dependent on large complex molecules‚ known as macromolecules. The objective of this lab was to correctly identify which macromolecules the unknown solution was comprised of using various substances as experimental controls. There are four major types of biological macromolecules
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