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1. What is the significance of the formation of the colored product in the oxidase test?
- Answer this comprehensively and please, do not just copy from somewhere.
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- 1. What results are expected if you drop H2O2 into a cut on your arm? Explain why those results are expected. 2. To do this test, why do you have to grow the organism in medium containing tryptophan? 3. Why is a red color after the addition of zinc a negative result for nitrate reductase?1. What are the enzymes that are being tested in a litmus milk medium? Answer this comprehensively and please, do not just copy for somewhere.1. Proteus vulgaris is positive for the production of the enzyme phenylalanine whereas Escherichia coli is not. Please describe the chemical reactions of the test that you will use to show this.
- Oxidase Test:In the document you submit, please describe the results for this test… (like yellow equals what?) 1) Give me the expected results for Escherichia coli and Pseudomonas aeruginosaLysozyme and benzonase are included in the lysis buffer, given that these are enzymes, one might not see bands for them on electrophoresis gel (SDS PAGE), why?Gelatin Hydrolase: 1. Explain the incubation conditions 2. Explain the reagents being added 3. Explain the observations in Gelatin Hydrolase 4. Explain the interpretations in Gelatin Hydrolase
- Ex. 5-4 Catalase 1) In the Catalase test (5-4), if bacteria was added to hydrogen peroxide on the slide, it might produce a false result. 2) Explain why adding bacteria to the hydrogen peroxide on a slide rather than adding the hydrogen peroxide to the bacteria on the slide might give a false result? 3) Would the false result be a false positive or would the false result be a false negative?1. Give the importance of carbohydrate fermentation test in biochemical testing and enumerate the enzymes that are involved. (5 points) 2. What are the substances added in the culture media utilized by the organism producing hydrogen sulfide? Give 2 other media used for the production of hydrogen sulfide. (5 points) 3. Explain the mechanism taking place in the hydrolysis of urea which leads to the formation of bluish red color. ( 5 points) 4. Discuss why human blood plasma will not always yield reliable results. (5 points)1.State the principle that underlies the following biochemical tests: a) Methyl red testb) Voges-Proskauer test 2. how does oxidative phosphorylation differ from substrate-level phosphorylation?
- 1. Proteus vulgaris is positive for the production of the enzyme phenylalanine whereas Escherichia coli is not. Please describe the chemical reactions of the test that you will use to show this. 2. How will you be able to distinguish between those organisms that are able and those that are not able to hydrolyze starch?What is the need of adding DNS solution to the enzyme substrate solution bWhat is the problem in determining rates at low substrate concentration? c. Calculate the Activity of an amylase enzyme which is diluted 1:100 times with phosphate buffer and incubated for 10 minutes at 37 degree Celsius. Given are the amount of maltose [mg] = 5.05 and the volume of enzyme used for the assay as 0.5ml.Catalase: 1. Explain the incubation conditions 2. Explain the reagents being added 3. Explain the observations in Catalase 4. Explain the interpretations in Catalase