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Edexcel A-Level Biology AS 1.3 Core Practical 1 Reducing Sugars and Starch Questions

Practise using Benedict’s reagent and iodine with colour standards to identify reducing sugars or starch and estimate concentration semi-quantitatively using marked evidence.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Use Benedict’s reagent and iodine tests to identify reducing sugars and starch.
  • Use colour standards and controlled procedures to estimate carbohydrate concentration semi-quantitatively.
  • Distinguish quantitative from semi-quantitative results and calculate or infer starch mass or concentration.
  • Interpret calibration data and explain test limitations for sucrose, maltose and lactose.

Edexcel A-Level Biology AS 1.3 Core Practical 1 Reducing Sugars and Starch Questions question 1

[Maximum number: 4]

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

Question (a)

(a)

Describe how a urine sample can be tested for glucose.

[ 2 ]

Question (b)

(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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