JAMB Biology 2011 Objective — Question 32

Question 32 of 60 from the Joint Admissions and Matriculation Board (JAMB) Biology 2011 Objective paper, with the correct answer and a full explanation.

A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution was added to a food substance. The food substance is likely to be a

A. A. carbohydrate
B. B. fat
C. C. proteinCorrect
D. D. sugar

Explanation

This is the Biuret test, which gives a purple/violet colour in the presence of protein.

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