We use chemical reagents in food tests to identify the presence of biological molecule.Identify the correct colour change you would expect, when a substance tests positively for the presence of glucose after Benedict's solution is added.Blue to purpleOrange-brown to blue-blackClear to cloudy emulsionBlue to brick redI DON'T KNOWSUBMIT ANSWER

We use chemical reagents in food tests to identify the presence of biological molecule.Identify the correct colour change you would expect, when a substance tests positively for the presence of lipid after ethanol and water are added.Clear to cloudy emulsionBlue to brick redOrange-brown to blue-blackBlue to purpleI DON'T KNOWSUBMIT ANSWER

If a reducing sugar is present what colour will Benedict's solution change to?

hich one of the following reagents is used to test for the presence of glucose (a reducing sugar)?Benedict’s reagentEthanol and waterBiuret reagentIodine solution

Evie wanted to confirm whether a particular food substance contained sugar. There was no colour change when Benedict’s reagent was added. This was confirmed by multiple results of other students in Evie's class.However, the food packaging clearly stated that the substance had a high sugar content.Which one of the following best explains why there was a difference between the food test result and the food packaging?The test was only for non-reducing sugars, they need to test for the presence of the other types of sugars. This could explain why there was a difference between the food label and the food test results.The student did not add enough Benedict's reagent therefore a positive result might have been missed.The test was only for reducing sugars (e.g. glucose) and does not detect the presence other types of sugars, namely non-reducing sugars. This could explain why there was a difference between the food label and the food test results.There was not enough of the sample when adding Benedict’s reagent.I DON'T KNOWSUBMIT ANSWERLearning MaterialChoose your materialCENTURY ExplainsSlideshowInvestigating Biological MoleculesResults TableEquipment IEquipment IIReagentsMethod: Preparing the Food Samples IMethod: Preparing the Food Samples IIMethod: Testing for Glucose (Reducing Sugar) IMethod: Testing for Glucose (Reducing Sugar) IIMethod: Testing for Glucose (Reducing Sugar) IIIResults: Testing for Glucose (Reducing Sugar)Method: Testing for StarchResults Table: Testing for StarchMethod: Testing for ProteinResults Table: Testing for ProteinMethod: Testing for Lipids — Emulsion (Ethanol)Results Table: Testing for Lipids — Emulsion (Ethanol)Method: Testing for Lipids — Sudan III SolutionResults Table: Test for Lipids — Sudan IIIResults: SummaryQuestionQuestionQuestionQuestionQuestionQuestionQuestionQuestionQuestionQuestionQuestionQuestionQuestion

.Which test shows a positive result with a colour change of blue to purple?