Antibodies and vaccination
Cambridge A-Level Biology (9700) · Unit 11: Immunity · 8 flashcards
Antibodies and vaccination is topic 11.2 in the Cambridge A-Level Biology (9700) syllabus , positioned in Unit 11 — Immunity , alongside The immune system. In one line: Active immunity involves the body producing its own antibodies in response to antigen exposure (.
Marked as AS Level: examined at AS Level in Paper 1 (Multiple Choice), Paper 2 (AS Structured Questions) and Paper 3 (Advanced Practical Skills). The same content may also be assumed in Paper 4 (A Level Structured Questions).
The deck below contains 8 flashcards — 2 definitions and 6 key concepts — covering the precise wording mark schemes reward. Use the 2 definition cards to lock down command-word answers (define, state), then move on to the concept and calculation cards to handle explain, describe, calculate and compare questions.
The difference between active and passive immunity
Active immunity involves the body producing its own antibodies in response to antigen exposure (
What the Cambridge 9700 syllabus says
2025-2027 syllabus, in our words · AS LevelWhat the syllabus expects you to be able to do in this topic, in plain English. For the exact wording, see the official syllabus (PDF).
- Relate how antibodies are built at the molecular level to the jobs they do.
- Outline how monoclonal antibodies are made using the hybridoma method.
- Outline the principles behind using monoclonal antibodies both to diagnose disease and to treat it.
- Describe how active immunity differs from passive immunity, and how natural immunity differs from artificial immunity.
- Explain that the antigens in vaccines trigger immune responses that give long-term immunity.
- Explain the ways vaccination programmes can help stop infectious diseases from spreading.
Cambridge syllabus keywords to use in your answers
These are the official Cambridge 9700 terms tagged to this section. Mark schemes credit responses that use the exact term — weave them into your answers verbatim rather than paraphrasing.
Tips to avoid common mistakes in Antibodies and vaccination
- › Use precise terminology: describe antibodies as being 'degraded' or 'broken down' by enzymes over time.
- › Use the terms 'heavy chains' and 'light chains' exclusively when describing the polypeptide components of an antibody molecule.
- › Explain that different antibodies are needed for new strains because of changes in the molecular shape of viral antigens, not resistance.
- › Classify immunity as passive when antibodies are transferred from an external source and active only when the individual's own immune system produces them.
- › Fully identify the type of immunity using all descriptors, such as 'passive artificial immunity', when provided with evidence of antibody injections.
Relate the quaternary structure of an antibody to its function.
Antibodies have a quaternary structure consisting of four polypeptide chains (two heavy, two light) held together by disulfide bonds. This structure creates antigen-binding sites (variable regions) with specific shapes complementary to particular antigens, enabling targeted binding and immune response.
Outline the key steps of the hybridoma method for monoclonal antibody production.
1. Expose mouse to specific antigen. 2. Harvest spleen cells (containing antibody-producing B-lymphocytes). 3. Fuse B-lymphocytes with myeloma (cancer) cells to create hybridoma cells. 4. Select and culture hybridoma cells that produce the desired antibody.
Outline how monoclonal antibodies are used in disease diagnosis.
Monoclonal antibodies, highly specific, can detect presence and quantity of certain antigens in a sample. An example is ELISA (enzyme-linked immunosorbent assay) which tests for specific infections, pregnancy, and allergies.
Outline how monoclonal antibodies are used in disease treatment.
Monoclonal antibodies can target and bind to specific cells (e.g., cancer cells) or molecules, blocking their function or marking them for destruction by the immune system.
What is the difference between active and passive immunity?
Active immunity involves the body producing its own antibodies in response to antigen exposure (
What is the difference between natural and artificial immunity?
Natural immunity is acquired through normal life experiences, like exposure to a pathogen, or from mother to child. Artificial immunity is deliberately induced through medical procedures, such as vaccination or antibody injections.
Explain how vaccines stimulate an immune response.
Vaccines contain antigens (
Explain how vaccination programmes can control the spread of infectious diseases.
Vaccination programmes create herd immunity. When a sufficiently high percentage of the population is vaccinated, the spread of the infectious agent is significantly reduced, protecting even those who are not vaccinated.
Review the material
Read full revision notes on Antibodies and vaccination — definitions, equations, common mistakes, and exam tips.
Read NotesMore topics in Unit 11 — Immunity
Antibodies and vaccination sits alongside these A-Level Biology decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.
Key terms covered in this Antibodies and vaccination deck
Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.
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