The table shows observations after a virus enters a population of bacterial cells.
Table
| Time in minutes | Intact bacterial cells | Free virus particles |
|---|---|---|
| 0 | 100 | 0 |
| 20 | 100 | 0 |
| 40 | 10 | 9000 |
Which interpretation best explains the change between 20 and 40 minutes?
host cells divide and release the viruses from their chromosomes
viral DNA becomes integrated while host cells remain intact
host cells lyse after new virus particles have been assembled
viral proteins leave before any viral genetic material is copied
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.