Carbohydrates are essential biological molecules that provide energy and structure in living organisms.
Name the three main chemical elements present in all carbohydrate molecules.
Starch and glucose are related carbohydrates. Complete the table by inserting a tick (✓\checkmark✓) if the property applies or a cross (×\times×) if it does not.
| Substance | Is a polymer | Contains glycosidic bonds | Broken down by amylase | Absorbed into the blood in the small intestine | Is a reducing sugar |
|---|---|---|---|---|---|
| starch | |||||
| glucose |
Describe how you could test a liquid food sample for the presence of reducing sugars.
Give two safety precautions you would take when carrying out this test.
21 exam-style questions on Edexcel IGCSE Biology Biological molecules. Each one has a worked solution and a mark scheme showing where the marks go.