An antibody binds strongly to an antigen in a blood clot. A technician forgets to attach the radioactive marker before the antibody is injected.
What is the most likely result when a radiation detector is used?
The antibody cannot bind to the clot, but can provide the intended radioactive signal.
The antibody can bind to the clot, but cannot provide the intended radioactive signal.
The antibody can bind to the clot, which then produces its own radioactive signal.
The antibody cannot bind to the clot, because radiation normally creates the antigen shape.
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.