Laboratory Experiments in Microbiology (11th Edition)
11th Edition
ISBN: 9780321994936
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 3CT
If iodine were not available, how would you determine whether starch hydrolysis had occurred?
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Describe any change that took place when Iodine was added to the starch.
Why does glucose not give positive results with an iodine test but not starch?
We did an experiment about carbohydrate chemistry and the prof did not elaborate on the details. She just gave the positive result and reagent. I would like to ask the following:
1. What type of reaction occurred when the samples (enumerated) reacted with Benedict’s reagent? Give the chemical equation for each.a. Glucoseb. Sucrosec. Fructosed. Lactosee. Galactosef. Ribose
2. Explain the mechanism behind the test in simple terms.
3. What are the important products of the reaction of each sample?
Chapter 13 Solutions
Laboratory Experiments in Microbiology (11th Edition)
Ch. 13 - Prob. 1QCh. 13 - How can you tell that amylase is an exoenzyme and...Ch. 13 - If an organism grows in the OF-glucose medium that...Ch. 13 - Why is it important to first determine whether...Ch. 13 - Aerobic organisms degrade glucose, producing...Ch. 13 - How can organisms that dont use starch grow on a...Ch. 13 - If iodine were not available, how would you...Ch. 13 - Locate the H+ and OH- ions from the water molecule...Ch. 13 - You have isolated a bacterium from a patients...
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- We did an experiment about carbohydrate chemistry and the prof did not elaborate on the details. She just gave the positive result and reagent. I am would like to ask the following: 1. What type of reaction occurred when the samples (enumerated) reacted with the Iodine reagent? Give the chemical equation for each. a. Glucoseb. Sucrosec. Fructosed. Lactosee. Galactosef. Ribose 2. Explain the mechanism behind the test in simple terms. 3. What are the important products of the reaction of each sample?arrow_forwardwhat is the difference between glucogen and starcharrow_forwardCompare the molecular size/structure of starch and glucose. Then discuss why the iodine test was negative for starch in the first lab activity. PermalinkReplyarrow_forward
- Is it still possible to find polysaccharides in the result of starch hydrolysis? What tests may have been performed to prove this?arrow_forwardWe did an experiment about carbohydrate chemistry and the prof did not elaborate on the details. She just gave the positive result and reagent. I am would like to ask the following: 1. What type of reaction occurred when the samples (enumerated) reacted with the Moore’s reagent? Give the chemical equation for each.a. Glucoseb. Sucrosec. Fructosed. Lactosee. Galactosef. Ribose 2. Explain the mechanism behind the test in simple terms. 3. What are the important products of the reaction of each sample?arrow_forwardThe two most abundant pigments in the chromatography results were carotene and Xanthophyll. What colors are absorbed or reflected by various pigments and how much is there?arrow_forward
- Determine the number of biological forms that can exist for an aldopentose. 8 16 4 2arrow_forwardA student performed Benedict's reagent test on an monosaccharide. As she added Benedict's reagent to the sample, the reagent color changed from blue to brick red. Question 7 options: This test indicated that the monosaccharide does contain a chiral carbon. This test indicated that the monosaccharide sample is not a reducing sugar. This test indicated that the monosaccharide does not contain a chiral carbon. This test indicated that the monosaccharide sample is a reducing sugar.arrow_forwardWhy was sodium carbonate used in the extraction of caffeine from coffee?arrow_forward
- We would be having a lab activity about carbohydrates. I would like to ask the following to compare the theoretical result from whatever the experimental result would be. My questions are: 1. A paste of starch was tested using Benedict’s test, Iodine Test, and Fehling’s Test, what would be the result? Positive or negative? Explain why. 2. After adding conc. HCl to the paste, it was then tested in Iodine test. What would be the result of the test and explain the chemical reaction that happened to the paste. 3. After adding 0.5 mL of conc. HCl to the paste, another 5 drops of NaOH were added and was tested using the Fehling’s and Benedict Test. What would be the result of the test and explain the chemical reaction that happened.arrow_forwardWhich test can be used to differentiate the following pairs of carbohydrates? Explain why and why other tests are not possible. Kindly answer a, b, and c. a. Fructose and galactose b. Ribose and glucose c. Glucose and maltose Different tests are: Molisch Test, Seliwanoff's Test, Bial's Test, Anthrone's Test, Barfoed's Test, and Osazone Testarrow_forwardWhat difference can you observe in the iodine test for glycogen and starch? Explain the differencearrow_forward
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