Which of the following test is used to determine if proteins are present? Group of answer choices IKI Test CuSO4 Benedicts Grease Spot Conclusions pH paper
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- IKI Test (Iodine-Potassium Iodide Test): This test is used to detect the presence of starch, not proteins. - CuSO4 (Copper Sulfate): This is not a standard test for proteins; it's more commonly used in other chemical reactions. - Benedict's Test: This is a Show more…
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1. The Benedict's test is used to indicate the presence of reducing sugars. 2. The Biuret test is used to indicate the presence of proteins. 3. A Lugol's iodine (I2KI) test that looks amber is NEGATIVE for protein. 4. The Sudan IV test is used to indicate the presence of lipids. 5. Does the Biuret test allow us to identify the specific type of protein in a sample? Why/Why not? 6. Why is water an appropriate negative control for the monosaccharide/simple sugar test?
Sri K.
Biuret reagent tests for proteins. There are other reagents that test for other macromolecules. For carbohydrates, Benedict's reagent tests for simple sugars and iodine (IKI) tests for starch. For lipids, a simple grease spot test using a brown paper bag can be performed, where fatty substances will cause the spot to be translucent when held up to a light. Record the expected colors of solutions of the following substances when tested with these reagents and explain your hypotheses: Bread: Biuret: Benedict's: Iodine: Grease Spot: Explanation of hypothesis: Ground Beef: Biuret: Benedict's: Iodine: Grease Spot: Explanation of hypothesis: Soda: Biuret: Benedict's: Iodine: Grease Spot: Explanation of hypothesis: Diet Soda: Biuret: Benedict's: Iodine: Grease Spot: Explanation of hypothesis:
Adi S.
Benedict's test, Lugol's iodine test, Biuret test, and the Sudan III test were conducted on an unknown sample to determine which macromolecule(s) it contains. The test results are shown below: 1. Benedict's 2. Lugol's 3. Biuret 4. Sudan III For each of the following, circle whether the macromolecule was present or not in the unknown and explain which test result allowed you to arrive at your answer. a. Protein - present / not present Test used to arrive at answer: Explanation: b. Lipids - present / not present Test used to arrive at answer: Explanation: c. Monosaccharides - present / not present Test used to arrive at answer: Explanation: d. Polysaccharides - present / not present Test used to arrive at answer: Explanation:
Madhur L.
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