Summary

Summary AQA A Level Biology- Food tests Unit 1

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Module
Unit 1 - Biological molecules

Institution
AQA

Notes on the tests for carbohydrates, lipids and proteins sub-topic within AQA A Level Biology Unit 1- Biological Molecules. These notes contain sub headings with different methods of note taking like tables, images from online videos and concise bullet points.

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Uploaded on September 7, 2024
Number of pages 5
Written in 2024/2025
Type Summary

biology
biological
molecules
biological molecules
tests
carbohydrates
lipids
proteins
food tests
aqa
a level

⚪
Tests for Carbohydrates, Lipids
and Proteins

Tests for carbohydrates:
Benedict’s test- reducing sugars:

Tests for reducing sugars- carbohydrates.
A reducing sugar is a sugar that can give electrons to (reduce) other molecules.
They include all monosaccharides and most disaccharides like maltose and
lactose.

The sample to be tested is placed in a clean test tube

An equal volume of Benedict’s reagent (copper (||) sulfate) is added using a
pipette

Tests for Carbohydrates, Lipids and Proteins 1

, The solution is then heated in a boiling water bath for 3-5 minutes.

If reducing sugars are present, they will reduce the Cu2+ ions in copper (||)
sulfate to Cu+ ions, forming the orange-red precipitate copper (|) oxide.

Tests for Carbohydrates, Lipids and Proteins 2

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