This deep dive covers Antibodies and How They Work within Adaptive Immunity and Antibodies for GCSE Biology. Specific immune responses, antibody production, lymphocytes, memory cells It is section 4 of 15 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Antibodies and How They Work
Antibodies are Y-shaped proteins produced by plasma cells. Each antibody is complementary to one specific antigen — like a key fitting a lock. This makes them highly specific to one pathogen.
What antibodies do:
- Tag pathogens for destruction: Antibodies bind to antigens on a pathogen's surface, marking it so that phagocytes can recognise and engulf it
- Neutralise toxins: Antibodies (called antitoxins when they target toxins) bind to toxins released by bacteria, preventing them from causing harm
- Cause agglutination: Antibodies can clump pathogens together, making them easier for phagocytes to destroy
Key point: Antibodies do NOT directly kill pathogens. They tag or neutralise them — the actual destruction is carried out by phagocytes.
Practice questions for Adaptive Immunity and Antibodies
What are antigens?
Explain how lymphocytes produce antibodies to destroy a specific pathogen.
Quick recall flashcards
What is an antibody?
A protein produced by lymphocytes (white blood cells) that binds to a specific antigen.
Each antibody has a unique shape that fits one antigen only — like a lock and key.
What is an antigen?
A protein on the surface of a pathogen (or cell) that the immune system recognises as foreign.
Antigens trigger the body to produce antibodies.