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CIE AS Biology (9700) 2019-2021 Revision Notes

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2. Biological Molecules

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CIE AS Biology (9700) 2019-2021 Resources

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Page 1

CONTENTS

2.1 Testing for Biological Molecules

2.1.1 Biological Molecule Tests

2.1.2 The Benedict's Test

2.2 Carbohydrates & Lipids

2.2.1 Biological Molecules: Key Terms

2.2.2 The Glycosidic Bond

2.2.3 Starch & Glycogen

2.2.4 Cellulose

2.2.5 Triglycerides

2.2.6 Phospholipids

2.3 Proteins & Water

2.3.1 Amino Acids & the Peptide Bond

2.3.2 The Four Levels of Protein Structures

2.3.3 Protein Shape

2.3.4 Haemoglobin

2.3.5 Collagen

2.3.6 Globular & Fibrous Proteins

2.3.7 Water & the Hydrogen Bond

2.3.8 The Role of Water in Living Organisms

2.1 TESTING FOR BIOLOGICAL MOLECULES

2.1.1 BIOLOGICAL MOLECULE TESTS

Testing for Key Biological Molecules

There are a number of tests that can be carried out quickly and easily in a lab to determine if

a sample contains one of the key biological molecules (carbohydrates, proteins and lipids)

The following tests are qualitative – they do not give a quantitative value as to how much of

each type of molecule may be present in a sample

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