CAIE A-Level Biology AS 2.1.1 Benedicts Test for Reducing Sugars Questions

Use Benedict's test procedure and colour changes to identify reducing sugars and support conclusions with mark-scheme evidence.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Describe and interpret Benedict's test for reducing sugars, including the method, colour change and conclusion.

CAIE A-Level Biology AS 2.1.1 Benedicts Test for Reducing Sugars Questions question 1

[Maximum number: 1]

Many flowers produce a sweet solution called nectar. Bees provided with nectar use enzyme Q to change the nectar into honey.

After testing a sample of nectar for the presence of reducing sugar using standard laboratory reagents, the sample was blue. After testing a sample of honey in the same way, the sample was orange.

Which conclusion about the reaction catalysed by enzyme Q is consistent with these results?

type of reaction

substrate

product

condensation

maltose

glucose

condensation

sucrose

fructose

hydrolysis

sucrose

fructose

hydrolysis

maltose

glucose

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