Biology · May / June 2017 · Paper 21 · Question 7

Fig. 7.1 shows bacteria growing on the surface of a dish containing nutrient jelly. Paper discs, such as M and N, were soaked in solutions of different antibiotics and placed on top of the growing bacteria. A clear area on the jelly indicates that bacteria in that area have been killed. M N clear area Fig. 7.1

Read automatically from the paper; the printed page above is exact.