The table shows the percentage dry biomass of protein, lipid, and carbohydrate found in five different strains of cultivated marine microalgae.
| Microalgae Strain | Protein (%) | Lipid (%) | Carbohydrate (%) |
|---|---|---|---|
| Chlorella vulgaris | 51.2 | 14.5 | 17.3 |
| Dunaliella salina | 12.8 | 8.4 | 45.6 |
| Nannochloropsis oculata | 28.5 | 38.4 | 12.1 |
| Spirulina platensis | 62.4 | 6.2 | 15.1 |
| Tetraselmis suecica | 35.0 | 11.2 | 22.8 |
Which strain of microalgae contains the least protein?
Calculate how many grams of protein are present in 1.5 kilograms of Spirulina platensis. Show your working.
Which strain of microalgae would provide the most energy per gram of dry biomass?
Give two functions of lipids in the human body.
Name the chemical element found in all proteins but not in carbohydrates or lipids.
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.