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CAIE A-Level Biology AS 2.1.3 Emulsion Test for Lipids Questions

Use the emulsion test reagents and observation to identify lipids and support conclusions with mark-scheme evidence.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Describe and interpret the emulsion test for lipids, including the reagents, method and observation.

CAIE A-Level Biology AS 2.1.3 Emulsion Test for Lipids Questions question 1

[Maximum number: 1]

Which set of steps is the best method for conducting the emulsion test for lipids?

A

Add 2 cm32 \mathrm{~cm}^{3} of water to the sample. Pour the water into a test-tube containing 2 cm32 \mathrm{~cm}^{3} of ethanol. Lipids are present if the mixture becomes cloudy.

B

Add 2 cm32 \mathrm{~cm}^{3} of ethanol to the sample and shake. Pour the ethanol into a test-tube containing 2 cm32 \mathrm{~cm}^{3} of water and boil. Lipids are present if the mixture becomes clear.

C

Add 2 cm32 \mathrm{~cm}^{3} of water to the sample and shake. Pour the water into a test-tube containing 2 cm32 \mathrm{~cm}^{3} of ethanol and boil. Lipids are present if the mixture becomes cloudy.

D

Add 2 cm32 \mathrm{~cm}^{3} of ethanol to the sample and shake. Pour the ethanol into a test-tube containing 2 cm32 \mathrm{~cm}^{3} of water and shake again. Lipids are present if the mixture becomes cloudy.

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