(a)[2]
Name two ways in which a bacterium may become resistant to an antibiotic.
(b)[1]
The World Health Organisation regularly studies bacterial DNA sequence data. Suggest one way in which this helps to solve the problem of antibiotic resistance in bacteria.
(c)[3]
Some infectious bacterial diseases are treated with the antibiotic streptomycin. If a person does not finish the prescribed course of streptomycin, bacteria are more likely to become resistant to the antibiotic. Explain why a streptomycin-resistant strain of bacteria is more likely to develop through natural selection when a person does not complete the prescribed course of antibiotics.