An antibiotic prevents bacteria from making cell walls. A patient has a viral infection and a secondary bacterial infection.
Which statement explains the expected effect of the antibiotic?
It affects the virus because it makes cell walls, but not the bacteria.
It affects both pathogens because they make cell walls, but not human cells.
It affects the bacteria because they make cell walls, but not the virus.
It affects neither pathogen because only human cells can make new cell walls.
45 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.