Monoclonal Antibodies — GCSE Biology Revision
Revise Monoclonal Antibodies for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Human Defence SystemsWhat is Monoclonal Antibodies?
Monoclonal antibodies are identical antibodies produced from a single clone of a B-lymphocyte. They are designed to bind to a specific target molecule, or antigen. This specificity makes them incredibly useful for a range of medical applications, including diagnosis, such as in pregnancy tests, and treatment, such as for cancer.
Board notes: Covered by all major boards (AQA, Edexcel, OCR), particularly at the Higher tier. The production process and their uses in diagnosis and treatment are key.
Step-by-step explanationWorked example
In a pregnancy test, monoclonal antibodies are used to detect the hormone hCG in urine. One set of antibodies, with a blue bead attached, binds to hCG. This complex then moves up the test strip and binds to another set of antibodies fixed in the test window, creating a visible blue line if hCG is present.
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Common mistakes
- 1Confusing monoclonal antibodies with antibiotics. Antibiotics are drugs that kill bacteria, whereas monoclonal antibodies are proteins that target specific cells or molecules.
- 2Thinking they are a 'cure-all'. While powerful, monoclonal antibody therapies are expensive to produce, can have side effects, and are not yet available for all diseases.
- 3Forgetting how they are produced. They are made by fusing a B-lymphocyte from a mouse with a tumour cell to create a hybridoma, which can then be cultured to produce large quantities of the desired antibody.
Monoclonal Antibodies exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Monoclonal Antibodies
Core concept
Monoclonal antibodies are identical antibodies produced from a single clone of a B-lymphocyte. They are designed to bind to a specific target molecule, or antigen. This specificity makes them incredib…
Frequently asked questions
How are monoclonal antibodies used to treat cancer?
Monoclonal antibodies can be designed to bind to specific antigens on the surface of cancer cells. They can then trigger the immune system to attack the cancer cells, block signals that cause cancer cells to grow, or deliver toxic drugs directly to the tumour.
What are the ethical issues with monoclonal antibodies?
The production of monoclonal antibodies involves the use of mice, which raises ethical concerns for some people regarding animal welfare. There have also been some severe side effects in patients during early trials.