Two species of bacterium were each grown in nutrient broth. Both cultures started with 4.0 × 102 bacteria.
Species A has a mean division time of 30 minutes. Species B has a mean division time of 45 minutes.
Calculate the number of species A bacteria present after 6 hours. Give your answer in standard form.
After 6 hours there are 1.024 × 105 species B bacteria.
Calculate how many times greater the number of species A bacteria is than the number of species B bacteria.
The mean division times of the two species differ by only 15 minutes.
Explain why this small difference produces a very large difference in the number of bacteria after 6 hours.
163 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.