How would a vaccine prevent someone getting an infection?
Vaccines are made of dead or inactive pathogens. White blood cells in the body come into contact with the pathogen and produce antibodies which destroy the pathogen. The body produces memory cells which means when it is reinfected by the pathogen, it can quickly produce antibodies to destroy the pathogen before symptoms develop.
ND
Related Biology GCSE answers
All answers ▸An airtight compost heap causes anaerobic decay. Explain why the gardener might be against producing compost using this method
My knowledge of biology is good but I never seem to get all the marks on a question - how can I get as many marks as possible?
Describe the course of blood through the heart and lungs, explaining how it becomes oxygenated.
Carbon Dioxide and water are needed for photosynthesis. Write a balanced symbol equation for photosynthesis.