A student compares the mass of DNA extracted from two fruits. Each fruit is tested three times using the same method and the same mass of fruit.
Table
| Fruit | Mass of DNA in test 1 / mg\text{mg}mg | Mass of DNA in test 2 / mg\text{mg}mg | Mass of DNA in test 3 / mg\text{mg}mg |
|---|---|---|---|
| P | 1.2 | 1.4 | 1.3 |
| Q | 0.7 | 0.9 | 0.8 |
What is the difference between the mean masses of DNA collected?
0.4 mg0.4\ \text{mg}0.4 mg
1.5 mg1.5\ \text{mg}1.5 mg
0.6 mg0.6\ \text{mg}0.6 mg
0.5 mg0.5\ \text{mg}0.5 mg
44 exam-style questions on Edexcel GCSE Biology 3.2 DNA and protein synthesis, covering 3.2.1 DNA structure as a polymer, 3.2.2 Genome and gene definitions, 3.2.3 Extracting DNA from fruit, 3.2.4 Base order determines protein shape, 3.2.5 Stages of protein synthesis, 3.2.6 Non-coding DNA variants affecting phenotype, and 3.2.7 Coding DNA variants affecting phenotype. Each one has a worked solution and a mark scheme showing where the marks go.