Two towns, K and L, are each at risk from a different strain of the same bacterial species. Scientists tested blood samples from people in each population for immunity to the local strain. They also treated samples of each strain with the antibiotic usually used for infections caused by this bacterial species.
| Investigation result | Population K and strain K | Population L and strain L |
|---|---|---|
| People with immunity to the local strain | 18 out of 120 | 105 out of 150 |
| Bacteria alive before antibiotic treatment | 1.0 × 106 | 8.0 × 106 |
| Bacteria alive after antibiotic treatment | 8.0 × 105 | 1.6 × 106 |
Which conclusion about the two populations is best supported by the results?
Population L is more vulnerable because a smaller proportion is immune and a greater proportion of strain L survives the antibiotic.
Population L is more vulnerable because a greater proportion is immune and a smaller proportion of strain L survives the antibiotic.
Population K is more vulnerable because a smaller proportion is immune and a greater proportion of strain K survives the antibiotic.
Population K is more vulnerable because a greater proportion is immune and a smaller proportion of strain K survives the antibiotic.
71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.