In a waste-water treatment study, two bacterial samples grow under ideal conditions for 3 hours.
| Sample | Number of bacteria at the start | Mean division time |
|---|---|---|
| P | 12 | 30 minutes |
| Q | 3 | 20 minutes |
Which statement about the bacterial populations after 3 hours is correct?
Sample P contains four times as many bacteria as sample Q.
Sample P contains twice as many bacteria as sample Q.
Sample Q contains eight times as many bacteria as sample P.
Sample Q contains twice as many bacteria as sample P.
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.