An agricultural researcher has two liquid samples extracted from a seed. She wants to test one sample for the presence of starch and the other for the presence of lipids.
Describe the two chemical tests she should use to identify each biological molecule.
Different groups of organisms have cell walls made of different substances.
Complete the table to show an example from each group of organisms and the main chemical component of their cell wall.
| Group | Example from the group | Main chemical component of cell wall |
|---|---|---|
| plants | [Box 1] | cellulose |
| fungi | yeast | [Box 2] |
| bacteria | [Box 3] | [Box 4] |
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.