why would you perform an indole test?

Q: what does it mean if a bacteria tested positive for indole

A: Like several biochemical bacterial experiments, the results of the indole test are indicated by a…

Q: If you run the Lugol's test on an unknown solution and you get a black color at the end, what does…

A: The use of Lugol's iodine reagent is used to differentiate starch and glycogen from other…

Q: What is the result for the yellow tube of Methyl red test? What must the pH be in each tube? What is…

A: Methyl red test This test usually aims to differentiate the facultative anaerobes enteric bacteria.…

Q: Why does the oxidase test have to be read quickly?

A: The Oxidase test is a biochemical test for the identification of bacteria. The test is mainly…

Q: The table below summarizes the results for Millon's test. Provide the correct remarks from the…

A: Millon’s test is an analytical test used for the detection of the hydroxy phenol groups. Since the…

Q: What amino acid found in proteins causes the response in the Hopkins- Cole test?

A: Amino acids are the simple basic units that are used to make up all the proteins inside the cell.…

Q: What is the result of tube A in this Voges-proskauer test? What are the reagents of this test? What…

A: Voges-proskauer test is performed to differentiate between facultative anaerobic enteric bacteria.

Q: How would you interpret this catalase test

A: Catalase is an enzyme which can convert hydrogen peroxide to oxygen and water and thereby decrease…

Q: where will you dispose of the waste from Molisch test?

A: Sugars or carbohydrates are the most abundant biopolymers in living organisms. Carbohydrates are…

Q: Why should the use of nichrome or iron containing loop/wire be avoided as an inoculating device when…

A: The oxidase is a test used in microbiology to identify bacteria that produce cytochrome c oxidase.…

Q: Does Escherichia coli provide positive or negative results for the lysine decarboxylase and…

A: Ornithine decarboxylase test detects whether bacteria uses ornithine amino acid for carbon source…

Q: What is the chemical basis of Molisch test?

A: Molisch test is a colorimetric method that is used to detect the presence of carbohydrates in a test…

Q: Provide the Principles and detailed procedures of the following tests for the "Color Reaction of…

A: Hopkins - cole test Principle -In this test , concentrated H2So4 cause dehydration of tryptophan…

Q: Which of the following below will show a NEGATIVE result in Huble’s test? Group of answer choices…

A: Lipids are carboxylic groups is attached to a long hydrocarbon chain. On the basis of the presence…

Q: What is the difference between normal and reverse phase chromatography?

A: The main Difference between Normal and reverse phase chromatography is 1) In normal phase…

Q: Which is the better reagent for the clinical test between Fehling's solution and Benedict's…

A: The reducing sugars get oxidized by reducing some other component. This reducing property of these…

Q: What test could be used to differentiate between glucose and fructose? Explain

A: Glucose and fructose both are monosaccharide and are hexose sugar i.e having 6 carbon ring in their…

Q: How can polarography detect the analyte?

A: Jaroslav Heyrovsky discovered polarographic method   Polarography is a simple method in analytical…

Q: Why is it important that the agarose is exposed to ethidium bromide, which is either added to the…

A: Ethidium bromide is utilized during separation of fragments of DNA by agarose gel electrophoresis.…

Q: Polysaccharides generally do not give a positive test with Fehling’s solution. Why? *

A: Postive test with Fehling's solution- Given by reducing sugar  Polysaccharides- Long chain of…

Q: A carbohydrate sample reacts positively with all test reagents except for Lugol's. The sample could…

A: Carbohydrates are the chief biomolecules which act as energy source. Most of the body cells depend…

Q: The compound used in anti-malarial drug is_______?

A: Malaria is a mosquito-borne infectious disease. It is generally caused by single-celled…

Q: Of the two principal polymers used in column chromatography and electrophoresis, which one would be…

A: Column chromatography is a purification method that uses the polarity of compounds for the…

Q: How do I find the optimal temperature for the iodine and starch experiment?

A: The optimal temperature for a particular enzyme is the temperature at which the enzyme attains…

Q: what is the practical application of milk test of aldehydes?

A: Milk powder is an important product for both direct consumption and as a food ingredient. The milk…

Q: Why does the oxidase test must be performed from blood agar or another medium without a fermentable…

A: Biochemical tests are used to identify microbial diversity based on variations in the biochemical…

Q: Why sucrose gives negative Benedict test?

A: Benedict's reagent is a chemical reagent which is a mixture of sodium carbonate, sodium citrate, and…

Q: What is the role of ethidium bromide in the procedure and why do other scientists find alternatives…

A: INTRODUCTION Agarose gel electrophoresis This is a type of gel electrophoresis used for the…

Q: Will disaccharides and polysaccharides give a positive result for Molisch test?

A: Disaccharides: Di means two which means it is a double sugar. It is a sweet white crystalline solid…

Q: Why do we add powdered zinc to the nitrate reduction test?

A: Bacteria are prokaryotic simple unicellular organisms. Their mode of respiration may be aerobic or…

Q: Why must alcohol be diluted with water to about 70 % percent before it could be used as an effective…

A: 70% isopropyl alcohol is most commonly used as disinfectant and killing all surface microorganisms.…

Q: In making red blood cell suspension, why do we need to wash red blood cells in saline?

A: Red cell suspension is a common reagent used for many serologic procedures. Red cell suspensions…

Q: Explain how to perform a catalase test and what a positive result looks like

A: Catalase enzyme is a common enzyme that is found in all living beings that survive in oxygen and…

Q: Instead of Molisch's test, what specific test can be used to detect the presence of pentose sugar?…

A: Molisch's test are used for the detection of carbohydrate.

Q: what color will cellulose turn for iodine test?

A: Cellulose is an important component of cell wall of plants. It is a Polysaccharide made up of beta D…

Q: You treat cells briefly with radioactively labeled cysteine and then transfer them to a medium with…

A: Cysteine is a nonessential amino acid. It is one of the amino acid that contains sulfur which allows…

Q: What is doping?   Explain the mechanism of mass spectrometry.

A: In semiconductor production: Doping is the intentional introduction of impurities into an intrinsic…

Q: Why is cobalt chloride paper used in the experiments?

A: The indicators are used in the experiment to detect the distinct observable change. Many types of…

Q: An unknown sample was titrated with CH3COOH. After making the titration curve, no steep change was…

A: CH3COOH is a weak acid hence it will not dissociate completely in the aqueous solution to form…

Q: The table below summarizes the results for Hopkins-Cole test. Provide the correct remarks from the…

A: The amino acid tryptophan has a side chain containing an indole ring.

Q: What amino acid present in proteins is responsible for the reaction in Hopkins- Cole test ?

A: Amino acids are the monomer of the protein. Each amino acid has a carboxyl group, an amino group, a…

Q: Which sample shows positive results in benedict's test? why?

A: Introduction: Benedict's test is a simple science test used to recognize reducing sugars.

Q: What is the basic purpose of the paper chromatography?

A: Chromatography is an important analytical method used to separate a mixture of chemical substances…

Q: Provide a detailed conclusive analysis for the preparation of methyl orange.

A: Preparation of methyl orange : Methyl orange is prepared from sulphanilic acid. Sulphanilic acid…

Q: Please explain why is 70% ethanol used as an effective disinfecting solution in labs? Why not 95%…

A: Only 70% alcohol is effective as a disinfectant that is killing the microorganism on the surfaces.…