Testing For Biomolecules Lab Answers

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• [DOWNLOAD] Testing For Biomolecules Lab Answers

  IKI contains special tri-iodine ions which interact with the coiled structure of a starch polymer. Prior to a reaction, the IKI displays a yellow-brown color; however, after reacting with starch, a dark purple or black color is presented. Based on...

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• [FREE] Testing For Biomolecules Lab Answers | latest!

  Interpret the results when presented with data for each of the biochemical tests. Design experiments to identify biomolecules using biochemical tests. The Benedict's test identifies reducing sugars monosaccharide's and some disaccharides , which...

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• Quiz On Biomolecules

  Carbohydrates: Reducing sugars and starches Reducing Sugars Some sugars such as glucose are called reducing sugars because they are capable of transferring hydrogens electrons to other compounds, a process called reduction. When reducing sugars are mixed with Benedicts reagent and heated, a reduction reaction causes the Benedicts reagent to change color. The color varies from green to dark red brick or rusty-brown, depending on the amount of and type of sugar. Increasing amounts of reducing sugar green orange red brown In a typical Benedicts Test shown below , approximately 1 ml of sample is placed into a clean test tube along with10 drops of Benedict's reagent CuSO4. The reactions are heated in a boiling water bath for 5 minutes. Below: The test solutions and Benedict's reagent are boiled in a water bath for five minutes. Click on the image to view an enlargement.

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  Press the "Back" button to return. Below: Results of several solutions tested with the Benedict's test Click on the image to view an enlargement. Activity 1: Draw a large chart containing four equally divided columns and seven rows. In the fourth column, draw the reacting functional group s of the samples that reacted with the benedict's reagent.

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• Food Chemistry Experiments

  Starches Iodine solution IKI reacts with starch to produce a dark purple or black color. KI Reagent: Iodine is not very soluble in water, therefore the iodine reagent is made by dissolving iodine in water in the presence of potassium iodide. This makes a linear triiodide ion complex which is soluble. The triiodide ion slips into the coil of the starch causing an intense blue-black color. If you were to set up an Iodine test, you would perform the following: Use a wax marker to mark two test tubes 1 cm from the bottom. Be sure to stir the starch before filling your tube. Add two drops of IKI solution to each tube and note any precipitation or color change. Activity 2:Design a chart and record your predictions for the starch test for reaction tubes The results of a positive and negative control have been included in reaction tubes 1 and 2, respectively, for your convenience.

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• Tests And Indicators For Biomolecules With Answer Key

  Below left: starch solution and IKI - Iodine turns dark in the presence of starch dark: Positive control Below right: distilled water and IKI clear: negative control Click on the image to view an enlargement. Test tube 5: onion solution hint: see diagram 2b below, then refer to the results of the benedict's test using onion Test tube 6: Potato solution hint: see diagram 2a below, then refer to the results of the benedict's test using starch Draw a potato cell in the space provided. Label the cell wall and starch granules. Potato cells stained.

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• Testing For Biomolecules

  This glycosidic bond is hydrolyzed to obtain the constituent monosaccharides from the disaccharide. Which of these statements is false regarding metabolism? Various pathways may crisscross each other. Metabolic pathways may be both circular and linear in nature. Biomolecules do not have a turnover. True or false? Their levels keep changing as they are converted into other products through the process of metabolism. Hence, they have a turnover. Which of these do not characterize the flow of metabolites in the body? The flow may be linear or circular. However, it follows specific metabolic pathways and not arbitrary ones.

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• Biology Practice Exam

  Abstract This lab was done to test for macromolecules consisting of carbohydrates, lipids, proteins, and nucleic acids by using specific reagents to test for each. The result would bring out a specific color change in the macromolecule. A color change would verify the sample positive for that macromolecule. An educated guess was made that glucose and sucrose held simple sugars and starch did not. The results concluded this. For starch, iodine was used as a reagent. The hypothesis was that color would change blue-black on the starch sample and not on the sugar samples. Also, tested was an onion and potato. The hypothesis was that the potato contained starch and the onion did not. The results of this were also conclusive. For proteins, Ninhydrin and biuret was used as the reagent.

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• Bio Lab Report 2

  Ninhydrin tested for both amino acids and protein. Biuret tests for protein only. For this experiment the only hypothesis was that the starch sample would more than likely not change color. The results included color changes with Ninhydrin solution on the Amino acid sample and the Albumin sample. Also the color changed for the Albumin sample when tested with Biuret reagent. For lipids, Sudan III was the reagent used. The hypothesis was that color would change with corn oil.

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• Introduction To Food Macromolecules

  The results concluded this and that egg white samples and honey did not contain lipids. Another test was done for lipids by rubbing substances on an unglazed paper. The oil, lard, and margarine were expected to leave a translucent spot and they did. Introduction Macromolecules are in all forms of life. These organic compounds are carbohydrates, lipids, proteins, and nucleic acids. These are monomers and they link together into long chains that form polymers. Different reagents can be used to find the presence of these macromolecules. Carbohydrates contain carbon, hydrogen, and oxygen. They offer energy and also provide cell support in plant cells. There are three classifications for Carbohydrates: monosaccharides, disaccharides, and polysaccharides. Monosaccharides are the simple sugars. Two monosaccharides make a disaccharide. Three or more monosaccharides are a polysaccharide. Glucose, fructose, and galactose are monosaccharides. Sucrose, lactose, and maltose are disaccharides.

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• Testing For Biomolecules LAB

  Starch and glycogen are polysaccharides. Proteins are made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. Proteins are covalently bonded in chains as polymers of amino acids. These bonds are called peptide bonds. Amino acids linked together form a polypeptide called a protein. Some proteins are also enzymes. The ninhydrin test is used to find either amino acids or proteins. Lipids are macromolecules that are usually insoluble in water. Lipids are made of carbon, hydrogen, and oxygen. They are referred to as fats or triglycerides. Oils are liquid at room temperature and are called unsaturated. Solid fats are saturated. Lipids are found in cell membranes and are an energy source. By using the Sudan III test the presence of lipids can be found. The experiment started by cleaning the test tubes and labeling them 1 through 4.

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• Identification Of Biomolecules LAB TEST RESULTS

  I filled one tube with 10 drops of distilled water, another with 10 drops of glucose solution, another with 10 drops of sucrose solution, and 10 drops of starch solution in the last tube. I removed the test tubes from the bath and recorded the color changed in table 1. For the second carbohydrate lab, four test tubes were cleaned and labeled 1 through 4. Each tube was filled with 10 drops of a different solution consisting of distilled water, glucose solution, onion juice, and potato juice.

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• Identifying Nutrients

  All tubes were placed in boiling water for 3 minutes. Test tubes were removed from water and color changes were recorded in table 2. The third lab for carbohydrates consisted of cleaning four test tubes and labeling them 1 through 4. Each test tube was filled with 10 drops respectively of distilled water, glucose solution, sucrose solution, and starch solution. Three drops of iodine were added to each tube and swirled.

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• REVIEW: Biomolecules

  The color results were recorded in table 3. The fourth lab for carbohydrates was performed by slicing a piece of onion and looking at it through a microscope. A drop of iodine was added. Then a thin slice of potato was examined under the microscope. Color change results were recorded in table 4. The next group of tests were on amino acids and proteins. The first lab for amino acids was done by first cleaning 4 test tubes and labeling them 1 through 4. Then one tube was filled with 10 drops of distilled water, another tube with amino acid solution, another with albumin solution, and the last with starch solution. Five drops of Ninhydrin solution was added to each tube. All four tubes were placed in a boiling water bath for 5 minutes. Test tubes were removed and any color change was recorded for each in table 5. The second test on proteins consisted of cleaning four test tubes and labeling them 1 through 4.

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• 2.3 Biological Molecules

  Each tube was filled with 10 drops of distilled water, amino acid solution, albumin solution, and starch solution respectively. Ten drops of sodium hydroxide were added to each tube. Five drops of copper sulfate solution was added to each tube and swirled to mix. The tubes were checked for any color change to violet and the results were recorded in table 6. The last groups of tests were on lipids. These tests consisted of using the materials: test tubes, distilled water, test tube rack, egg yolk, glucose solution, salad oil, cornstarch suspension, sudan III dye, corn oil, egg white, honey solution, lard, and margarine.

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• 250+ TOP MCQs On Biomolecules – Concept Of Metabolism And Answers

  The first test started by cleaning four test tubes and labeling them 1 through 4. Each test tube was filled with 10 drops of a different solution: distilled water, honey solution, corn oil, and egg white solution. Five drops of Sudan III were added to each tube and swirled to mix. Results of color change were recorded in table 7. The second lipid test was for fats and oils. This lab consisted of obtaining a piece of unglazed paper and drawing six 3 centimeter diameter circles on it. The circles were numbered 1 through 6. The following compounds were rubbed on each circle respectively: salad oil, glucose solution, lard, margarine, cornstarch, and distilled water. The results were recorded in table 8.

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• Testing For Biomolecules - WriteWork

  Nonpermeable d. None of the above. A cell membrane is a thin layer of molecules that surrounds the cell. Its function is to allow certain materials to enter the cell, yet, keep harmful materials out. In order to do this, the cell controls which substances can enter the cell through the membrane. The cell membrane is selectively permeable or semipermeable , which means that certain molecules, such as oxygen and water, are permitted to enter the cell. Molecules that are not recognized as helpful are not able to pass through the membrane. Incorrect answer.

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• Free Biology Practice Test From 1medicoguia.com

  Please choose another answer. A cell uses which of the following to accelerate chemical reactions enabling its metabolic machinery to operate? Centrasome c. Golgi apparatus d. Enzymes Enzymes are catalysts, chemicals that speed up chemical reactions. The conditions inside most cells do not allow reactions to proceed quickly enough to support life. For example, temperatures inside organisms are not hot enough for chemical reactions to take place quickly. Enzymes increase the rates of biological chemical reactions. Which of the following is not part of the metabolic sequence? Photosynthesis c. Hydoplasm d. Digestion Inside cells, sequences of chemical reactions take place to support life. These sequences are known as metabolic pathways. Photosynthesis, respiration, and digestion are all examples of metabolic pathways, or sequences. Photosynthesis is the metabolic pathway that produces oxygen and glucose in organisms with chlorophyll.

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• Real Lab Procedure

  Respiration breaks down molecules called ATP for cells to use as energy. Digestion breaks down food to be used to make energy in the form of ATP. Hydroplasm is not a known metabolic sequence. Which of the following are NOT organelles found in animal cells? Nucleus and golgi apparatus b. Cellular membrane and cytoplasm c. Mitochondria and ribosomes d.

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• Virtual Labs

  Chloroplast and central vacuole Chloroplasts and central vacuole are important organelles in plant cells. Chloroplasts contain chlorophyll and are the site of photosynthesis. Central vacuoles are used to store water in plant cells. All the other organelles listed are important to the function of animal cells and plant cells. Light initiates different types of cellular reactions. Which of the following responses to light converts the energy from light into a gain of potential energy?

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• Biomolecules Practice Tests

  Phototaxis c. Photosynthesis d. All of the above Photosynthesis is the process plant cells use to convert oxygen, water and sunlight into a usable form of energy. The product of photosynthesis is glucose sugar molecules. Glucose molecules are a form of potential energy that can be broken down by an organism to produce energy in the form of ATP molecules. Gene c. Protein d. Nucleus A gene is the basic unit of heredity. Genes are made of DNA sequences and act as instructions for making proteins although not all genes make proteins. Genes are found on chromosomes. Double c. Quadruple d. The DNA molecule looks like a twisted ladder and is referred to as a double helix. Each nucleotide contains a sugar molecule and a phosphate group, along with a nitrogen base. Genes are located within the cytoplasm of the cell. Hydrochloric acid c. Ribonucleic acid d. In the ribosome, the information coded onto messenger RNA is used to make proteins.

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• Identifying Nutrients Gizmo : Lesson Info : ExploreLearning

  When sexual reproduction occurs in multicellular organisms, a process takes place before cells fuse whereby a cell is left with half of its chromosomes, enabling the creation of a cell with a characteristic chromosome number. What is this process called? Osmosis c. Anabolism d. Differentiation During meiosis, gametes sex cells are formed by reducing the number of chromosomes found in somatic body cells by one half. This occurs so that when two gametes, one from each parent, fuse together, the embryo will contain the correct number of chromosomes.

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• Detection Of Carbohydrates, Proteins And Fats (Procedure) : Class 11 : Biology : Amrita Online Lab

  Without meiosis, offspring cells would contain double the number of chromosomes of normal adults and they would not be viable. Which of the following represents the largest group of biological classification? Kingdom c. Class d. Genus Biology uses a system of classification to group organisms together based on their characteristics. The levels of classification, from largest most inclusive to smallest most specific , include domain, kingdom, phylum, class, order, family, genus, species.

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• Biological Molecules – Concepts Of Biology – 1st Canadian Edition

  There are two types of cells, eukaryotic and prokaryotic. Which of the following cellular structures are found in both types of cell? Prokaryotic cells are found in bacteria and their structure is much more simple than eukaryotic cells. Prokaryotic cells have a few simple cellular structures such as a nucleoid region, ribosomes, and a plasma membrane. Eukaryotic cells have more highly developed cellular structures including organelles that support the function of the cell. Golgi apparatus and mitochondria are found in eukaryotic cells. Chloroplasts are found in eukaryotic cells that contain chlorophyll, such as plants.

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