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![POST-LAB QUESTIONS:
1. Discuss the chemical basis of the positive and negative results of the chemical
tests performed.
2. What type of lipid are the samples as indicated by the results?
3. Explain why oils become rancid.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4c236725-250b-4852-8f20-8faced4f135e%2F2b491f66-5c29-4919-8728-d370f2e48345%2Ffsz9zcn_processed.jpeg&w=3840&q=75)
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- QUESTIONS: 1. Why does nitric acid stain the skin yellow? 2. How does the Xanthoproteic test differ from the Heller's test? 3. What is the formula of the colored precipitate obtained in the Nitroprusside test?Procedure: 1. Prepare 6 test tubes and place 1 ml saliva in each. 2. Add Iml water to tube 1,2 ml to tube 2, 4 ml to tube 3,6 ml to tube 4, 8 ml to tube 5 and 10 ml to tube 6. Mix thoroughly. 3. Transfer 1 ml of each into 6 separate test tubes (discard excess solution) and add 1 ml of 1% starch paste. Mix well and heat in a water bath with temperature maintained at 40°C for 30 minutes. 4. Divide each of the contents of each tube into 2 and test with: a. Iodine Test – to half of the content of each tube, add 1 drop of iodine in KI and note the color produced. Compare the intensity of color in each of the 6 tubes. b. Benedict's – to 1 ml benedict's reagent, add 5 drops of the other half of each tube and heat in a boiling water bath for 3 minutes. Note color of precipitate. 5. Rank each tube according to decreasing reaction rate one (1) being the fastest to hydrolyze and 6 being the slowest.QUESTIONS: 1. What is mucic acid? 2. What is the principle involved in mucic acid test?
- Questions: 1- What is the purpose of the test tube containing distilled water in each test? 2- Why is glucose called a reducing sugar? 3- Name the reagents used to detect the presence of reducing sugar, amino acids, and protein? 27I. Give one(1) alternative testing method for one (1) of the ten parameters tested in a urine reagent strip. Discuss the following: a. Whether the alternative testing method was made before or after the urine reagent strip b. Summarized Procedure c. Causes for False Positives d. Causes for False NegativesProcedure: 1. Label 3 test tubes 1, 2 and 3. Place the substances in each test tube as indicated below: Tube 1% starch 0.1M NaCl Acid/base/water Saliva 1 10 ml 1 ml 1ml 0.05N HCI 2 ml 1 ml distilled H2O 2 10 ml 1ml 2 ml 1 ml 0.05N NaOH 3 10 ml 1 ml 2 ml 2. Mix well by shaking each tube and place in a water bath with temperature maintained at 40°C for 30 minutes. 3. Remove all tubes from the water bath and stir. 4. Perform iodine test by taking 1 drop from each tube and place in different holes of a spot plate. Add 1 drop iodine and mix. Note color. 5. Perform benedicts test. Benedict's – to 1 ml benedict's reagent, add 5 drops of the other half of each tube and heat in a boiling water bath for 3 minutes. Note color of precipitate. 6. If the result in iodine test is positive (violet to blue color) and the benedicts test is negative return the tubes in the water bath and wait for another 15 minutes. 7. Repeat procedure 4until the blue color of starch with iodine fail to appear. Note the…
- Procedure: 1. Prepare 5 test tubes. Place 1 ml of 1% starch and add 10 drops of saliva to each tube. Mix thoroughly. 2. Place the first tube in ice water, the 2nd tube leave at room temperature, the 3rd tube in 40°C , the 4th tube at 60°Cwater bath and the 5th tube boil for 2 minutes.. 3. Leave the 4 tubes in their respective temperatures for 30 minutes. The 4th tube allows to stand for 30 minutes after heating for 2 minutes. 4. Test the contents of each tube with iodine and benedict’s tests.POST-LAB QUESTIONS 1) Discuss how the following buffer systems work in the human body: a) Carbonate buffer system b) Phosphate buffer system c) ProteinsInstructions: 1. Shake each test tube and place in a water bath maintained at body temperature for one hour. 2. Add 2 drops of phenolphthalein to each of the tubes and note the color. 3. Using a dropper add 0.01 M NaOH to each of the tubes until a permanent light pink is obtained. 4. Record the number of drops of NaOH needed to neutralize the free fatty acids produced in each tube. Test tube 1. Virgin coconut oil and Neutral Pancreatin 2. Virgin coconut oil, Neutral Pancreatin, and Sodium Carbonate 3. Virgin coconut oil and Sodium Carbonate 4. Virgin coconut oil, Neutral Pancreatin, Sodium Carbonate, and Bile 5. Virgin coconut oil, Water, and Bile Color of hydrolyzate with phenolphthalein DON'T ANSWER THIS DON'T ANSWER THIS DON'T ANSWER THIS DON'T ANSWER THIS DON'T ANSWER THIS Number of Drops of 0.01M NaOH DON'T ANSWER THIS DON'T ANSWER THIS DON'T ANSWER THIS DON'T ANSWER THIS DON'T ANSWER THIS Answer the Questions below: 1. Based on the experiment above, what is the means of detecting…
- Modified True or False: Write CMB if the statement or question is correct. If the statement or question is incorrect write THE CORRECT ANSWER and UNDERLINE, the word/s that makes the statement or question incorrect. " The iodine toot ie ueod to toet forthe procence of otarch. The Denediat'eteet identifice redueing ougars -- 2 Piuret test is a general test for compOunde Sudan III/IV test is used to detect the hydrocarbon chains of lipids. Hwe or more poptide 4. 5. In 1842, Karl Nageli, was the first person who had seen rod-like structures present in the animal cells' nucleus. chromosomes were first studied by Walther Flemming in 1888. 7. 6. Satellite is a knob-like structure at the end of a chromosome that is present beyond the secondary constriction or distal to it. 8. Allosome_is the sex chromosome Karyotyping based on symmetry was formulated by Levitzky in 1941 10. Parm is the shorth part of chromosome An MRNA with many open reading frames is called polycistronic Ideogram is where we…Follow up Questions: 1. How does the cornstarch change as you add water? 2. What happens when you press down quickly on the cornstarch? 3. What happens when you press down slowly on the cornstarch? 4. What happens when you squeeze the mixture in your hand and then release your grip? 5. Describe the properties of the cornstarch mixture. Would you call it a solid or liquid? Explain. 6. How is the cornstarch – and – water mixture similar to the Earth's mantle? 7. How is it different from the Earth's mantle? 8. Why is the Asthenosphere said to have plasticity? 9. What causes the plasticity in the Asthenosphere? 10. As a result of the Asthenosphere's plasticity, how might this property affect the solid crust upper mantle (lithosphere) of the Earth?Can I Have Help With These Three Questions Please!! Thank You!! 1. Describe the purpose of lactose and LES Endo agar in water quality testing. 2. Briefly explain what is meant by presumptive, confirmed, and completed tests in water analysis. 3. If your readout is 0-0-0, it means that the MPN is less than two organisms/ 100 ml water. Also, if the readout is 5-5-5, it means the MPN is greater than 1,600 organisms/ 100 ml water. In this instance, what procedural modification is required to obtain a more significant result?