A doctor wants to locate a blood clot using a monoclonal antibody attached to a radioactive label.
Two antibodies are available. Antibody X was made against antigen X. Antibody Y was made against antigen Y.
The table shows where the antigens are found.
| Location | Antigen X | Antigen Y |
|---|---|---|
| Blood clot | Present | Present |
| Healthy blood cells | Absent | Present |
Which antibody should the doctor use? Explain your answer.
Explain why using antibody Y would make the blood clot difficult to locate.
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.