WJEC GCSE Science Double Award: Microorganisms and disease (Unit 4, Biology 2) overview
An overview of the Microorganisms and disease module in WJEC GCSE Science Double Award (Unit 4, Biology 2), mapping pathogens and disease, defence and the immune system, vaccines and antibiotics, and culturing microorganisms.
Reviewed by: AI editorial process; not yet individually human-reviewed
The Microorganisms and disease module gathers the disease and microbiology content of Biology 2 in WJEC GCSE Science Double Award. It explains what causes disease, how the body defends itself, how we treat and prevent disease, and how microorganisms are grown safely. This page maps the module and links to a focused answer page for each part.
The topics in this module
- Pathogens and disease
- The four types of pathogen, how diseases spread and how the spread is reduced. See Pathogens and disease.
- Defence and the immune system
- The body's barriers and how white blood cells defend the body. See Defence and the immune system.
- Vaccines and antibiotics
- How vaccines give immunity, how antibiotics work, and antibiotic resistance. See Vaccines and antibiotics.
- Culturing microorganisms
- Growing microorganisms on agar with aseptic technique and the clear-zone practical. See Culturing microorganisms.
How this module fits the exam
These topics sit in Unit 4 (Biology 2), a written paper of 1 hour 15 minutes worth 15%. Questions mix recall (pathogens, defences), the culturing practical, and extended explanation (vaccines, resistance).
How to study this module
- Learn the pathogens. The four types with examples and the routes of spread.
- Know the defences. Barriers and the two jobs of white blood cells.
- Master vaccines. How they give immunity through antibodies and memory cells.
- Understand antibiotics. They treat bacteria not viruses, and resistance from overuse.
- Learn the practicals. Aseptic technique and the clear-zone test, kept fair.
Then test yourself with the module quiz.