Some viruses can enter the lysogenic pathway. In this pathway, the viral DNA is inserted into the DNA of the host cell.
Explain why a person can be infected with a virus in the lysogenic pathway but have no symptoms for a long time.
The host cell divides by mitosis.
Explain why this increases the number of cells that carry the virus.
A trigger, such as stress, can cause the virus to leave the lysogenic pathway.
Describe what happens after the trigger.
43 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.