Doctors inject a patient with monoclonal antibodies carrying a radioactive marker. The antibodies bind to an antigen found on blood clots. A scanner detects a strong marker signal in one area of the patient's leg.
What is the best interpretation of the strong marker signal?
The labelled antibodies have accumulated by binding to a blood clot in that area.
The radioactive marker has accumulated by binding directly to a blood clot in that area.
The labelled antibodies have accumulated by binding to all antigens in that area.
The labelled antibodies have accumulated after breaking down a blood clot in that area.
60 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.