A scientist compared four species of bacterium isolated from woodland leaf litter. Each species was grown with enough nutrients and at a suitable temperature.
Each culture contained 250 bacteria at the start. The table shows the number of bacteria in each culture after 120 minutes.
| Species | Number of bacteria after 120 minutes |
|---|---|
| P | 500 |
| Q | 1000 |
| R | 2000 |
| S | 4000 |
What species had a mean division time of 40 minutes?
Species R
Species S
Species P
Species Q
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.