JAMB Biology 2023 Objective — Question 20

Question 20 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2023 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 were added to a food substance. The food is likely to be a

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

Explanation

This describes the Biuret test for protein; a purple/violet colour with sodium hydroxide and copper sulphate solution indicates the presence of protein. (Note: the original scanned booklet did not include the source diagram; the image shown is a representative illustration.)

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