A virus infects dividing cells in a moth larva. Tests show that viral genetic material has become joined to the DNA of the host cells. Before a change in environmental conditions, the tissue functions normally and no complete virus particles are detected. After the change in conditions, the number of complete virus particles increases rapidly.
Name the viral pathway occurring before the change in environmental conditions.
One infected host cell divides once. Both resulting cells then divide once more.
State the number of resulting cells expected to contain the viral genetic material.
A student writes three statements about the infection.
| Statement | Student's statement |
|---|---|
| A | Before the change in conditions, the tissue remains undamaged because the viral genes are active. |
| B | After the change in conditions, viral genetic material and viral proteins leave the host cell separately and assemble outside the cell. |
| C | Complete virus particles are released while the host cell remains intact. |
Give a scientifically correct replacement for the words in bold in each statement.
112 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.