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CAIE A-Level Biology 2.1.4 Biuret Test for Proteins Question Bank

Practise Biuret-test questions by choosing the correct protein reagents and interpreting blue-to-lilac, purple or violet results as peptide-bond evidence.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • use Biuret reagent or copper sulfate with sodium or potassium hydroxide for protein tests
  • interpret blue-to-lilac, purple, violet or mauve as a positive protein result
  • link a positive Biuret result to peptide bonds rather than naming a specific protein

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