Question

What is indicated by Benedict's solution changing from blue to orange when heated?

A. the presence of reducing sugars or monosaccharides
B. the presence of lipids or fats
C. the presence of proteins or peptide bonds
D. the presence of starches or complex carbohydrates

Answer 1

The substance to be tested is heated with Benedict's solution; formation of a brick-red precipitate indicates presence of the aldehyde group. Since simple sugars (e.g., glucose) give a positive test, the solution is used to test for the presence of glucose in urine, a symptom of diabetes.