The figure shows a monoclonal antibody and four antigens, P, Q, R and S, found on the surfaces of four different cells.
Figure: A monoclonal antibody molecule and four different cell surface antigens

Which antigen, P, Q, R or S, will the antibody bind to? Give a reason for your answer.
Explain why a monoclonal antibody can be used to target only one type of cell in the body.
42 exam-style questions on AQA GCSE Biology 3.2 Monoclonal antibodies (HT only), covering 3.2.1 Producing monoclonal antibodies and 3.2.2 Uses of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.