Producing monoclonal antibodies — AQA GCSE Biology
Test yourself on Producing monoclonal antibodies with AQA GCSE practice questions.
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Producing monoclonal antibodies explained
Monoclonal antibodies are identical antibodies produced from a single clone of cells, designed to target one specific protein antigen.
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For example, to make antibodies for pregnancy tests, a mouse is injected with the hCG hormone (antigen). The mouse's immune system produces B-lymphocytes that make the specific anti-hCG antibody. These lymphocytes are extracted and fused with a tumour cell to form a hybridoma cell. The hybridoma retains the tumour cell's ability to divide rapidly and the lymphocyte's ability to produce the desired antibody. Single hybridoma cells are cloned to give many identical cells, and the antibodies they secrete are collected and purified. Note: this entire topic is assessed at Higher Tier only.
Your focus
- Describe the sequential stages involved in producing monoclonal antibodies.
- Explain the specific role of hybridoma cells in the continuous production of monoclonal antibodies.
- State why monoclonal antibodies are identical and specific to one single protein antigen.
Producing monoclonal antibodies exam tips
Marking Points
- A specific antigen (e.g., hCG) is injected into a mouse to stimulate an immune response.
- B-lymphocytes that produce the specific desired antibody are extracted from the mouse.
- These lymphocytes are fused with tumour cells to create hybridoma cells.
- The hybridoma cells can divide rapidly by mitosis while continuously producing the specific antibody.
- A single hybridoma cell is cloned to produce many identical cells, and the monoclonal antibodies are collected and purified.
Examiner Tips
- 💡Always sequence the production steps logically: antigen injection, lymphocyte extraction, cell fusion, hybridoma cloning, and antibody purification.
- 💡Use the specific term 'hybridoma' and explicitly state its dual function: rapid cell division and specific antibody production.
- 💡Remember that monoclonal antibody production and its applications are strictly Higher Tier only content.
Common Mistakes
- Stating that the mouse directly produces monoclonal antibodies; correct this by explaining that mouse lymphocytes must first be fused with tumour cells to form hybridomas.
- Confusing the roles of the two cell types; correct this by specifying that lymphocytes produce the antibody, while tumour cells provide the ability to divide rapidly.
- Believing monoclonal antibodies can bind to multiple different antigens; correct this by stating they come from a single clone and are specific to one single binding site on one protein antigen.
- Applying this content to Foundation tier exams; correct this by remembering that the production and application of monoclonal antibodies is strictly Higher Tier only.