JAMB - Biology (2000 - No. 21)
The production of violet colouration, when dilute NaOH solution is added to a solution of food substance, followed by drops of 1% CuSO4 solution while shaking, indicates the presence of
protein
carbohydrates
fats
reducing
Explication
This is the Biuret's test which is a chemical test that detects the presence of peptide bonds in a substance, and is used to measure the amount of protein in a sample. - Option A