A lawn of one species of bacterium is grown with discs of antibiotics W, X, Y and Z. After incubation there is no clear zone at all around disc Y. What does this result show?
The bacteria were not spread evenly around disc Y
The bacterium is resistant to the antibiotic in disc Y
The antibiotic in disc Y killed the bacteria fastest
The antibiotic in disc Y spread furthest through the agar
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.