Biology Late Nite Lab: Biological Molecules Experiment 1: Test for Reducing Suga
ID: 273351 • Letter: B
Question
Biology Late Nite Lab: Biological Molecules
Experiment 1: Test for Reducing Sugars
What is indicated by Benedict's solution changing from blue to orange when heated?
Experiment 1: Test for Reducing Sugars
What color changes did you observe when you added Benedict's solution to the 5% glucose solution and heated it?
Experiment 1: Test for Reducing Sugars
Based on your results which of the solutions that you tested with Benedict's solution contained reducing sugars?
Experiment 2: Test for Starch
Which of the solutions that you tested with iodine solution had positive results?
Explanation / Answer
Experiment 1: Test for Reducing Sugars
What is indicated by Benedict's solution changing from blue to orange when heated?
It indicates the presence of the aldehyde group i.e presence of large amount of reducing sugar changes the color from blue to orange
Experiment 1: Test for Reducing Sugars
What color changes did you observe when you added Benedict's solution to the 5% glucose solution and heated it?
Benedict's solution starts as aqua blue. As it is heated in the presence of glucose it turns yellow to orange. The hotter the final color of the reagent, higher the concentration of reducing sugar..
Experiment 1: Test for Reducing Sugars
Based on your results which of the solutions that you tested with Benedict's solution contained reducing sugars?
Monosaccharides - Glucose
Disaccharides - Fructose
Experiment 2: Test for Starch
Which of the solutions that you tested with iodine solution had positive results?
Starch( Potato) - Blue or black colour indicates Positive
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