Edexcel IAL Biology 1.3 Core Practical 1 reducing sugars and starch

State reagent, volume, heating and observation details, prepare known standards under controlled conditions and compare the unknown against the colour scale.

Exam points

Describe Benedict's testing with reagent, a heated water bath and colour observation.
Prepare iodine colour standards from known starch concentrations for comparison.
Distinguish an exact quantitative value from a semi-quantitative concentration range.

[Maximum number: 4]

A simple test can be used to assess the quantity of sugar in liquids, such as food extracts and urine.

(a)

Describe how a urine sample can be tested for glucose.

[ 2 ]

(b)

Complete the table of results from tests on standard glucose solutions.

Table for Question (b) — Edexcel A-Level Biology AS

[ 2 ]

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1.3—Core Practical 1 - reducing sugars and starch question 1

Question (a)

Question (b)