The diagram shows how the effect of growing bacter
w4d)sb4fyjq9mh x588bj +dpg ia with different antibiotics can be investigated. A study was conducted to test the degree of antibiotic resistance that bacteria from a hospital door handle had developed. Measurements of the zone of inhibi
dm 8b 5w9)yxsb g4dph8+j4jqftion were taken every 3 days, for 15 days.
1.State which antibiotic is the least effective at preventing bacterial growth.
2.State two variables that must be controlled in this experiment, other than those already given.
3.1Identify the anomalous result from the study.
3.2Suggest how the anomalous result may have arisen.
4.Explain how natural selection can lead to antibiotic resistance in bacteria.
5.The researchers suggested that vancomycin could be used more extensively to treat bacterial infections. Discuss to what extent you agree with this.