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CAIE A-Level Biology 3.1.5 Colorimetry in Enzyme Reactions

Practise selecting a suitable wavelength, zeroing a colorimeter with an appropriate blank and converting absorbance changes over time into an objective reaction rate.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • choose a wavelength or complementary filter suited to the coloured substance measured
  • zero the colorimeter with a blank containing all components except the coloured analyte
  • record absorbance over time and derive reaction rate from objective numerical changes

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