How does a vaccine prevent infection?
When vaccine is given small amounts of the dead or inactive pathogen are inserted in to the blood, this activates the body's white blood cells which then produce antibodies. These antibodies destroy the dead or inactive pathogen and by doing so ensures that if the pathogen enters the body again it will be eliminated very quickly.
RB
Related Biology GCSE answers
All answers ▸Do prokaryotes have a nucleus.
Describe how pancreatic hormones regulate blood glucose homeostasis.
Two snails belong to the same species. Yellow shelled snails found in grassland areas, dark shelled ones in woodland. Shell colour determined by genes. Explain how natural selection could have caused this distribution of snails
Name and describe the function of the different organelles within a cell, and compare the differences within a plant and an animal cell.