Exam Tips: Monoclonal Antibodies

Hybridoma production — explain the WHY of each step: It is not enough to list the steps. Explain why each is necessary: B cells are used because they produce the specific antibody. Myeloma cells are used because B cells die quickly — myeloma cells provide immortality. The fusion is done in selective medium that kills unfused cells. This level of explanation is what distinguishes 4-mark answers from 2-mark ones.

Pregnancy test — name the hormone: The test detects hCG (human chorionic gonadotropin). Do not say it detects "pregnancy hormones" or "substances" — be specific. hCG is produced by the developing embryo after implantation and is the precise target of the monoclonal antibodies on the test strip.

Cancer treatment vs vaccine — a crucial distinction: Vaccines stimulate the immune system to make its own antibodies. Monoclonal antibody treatments provide ready-made antibodies. The patient's immune system is passive in monoclonal antibody treatment. This distinction is tested in higher-tier comparison questions.

Advantage of monoclonal — always link to application: "Monoclonal antibodies are more specific" alone earns one mark. "Monoclonal antibodies are more specific, meaning in cancer treatment they only bind to cancer cells and not healthy cells, reducing side effects" earns two marks. Always extend the advantage into its practical consequence.

Higher tier: know Herceptin as a named example: Herceptin (trastuzumab) targets HER2 receptors overexpressed on some breast cancer cells. It blocks the growth signal and flags the cell for immune destruction. This named example strengthens extended answers on cancer treatment with monoclonal antibodies.