In a healthy tissue the cell cycle is controlled, so cells only divide when new cells are needed. In a tumour this control of the cell cycle is lost.
Suggest how the loss of control of the cell cycle leads to a tumour forming.
A drug used to treat some tumours stops the cell fibres pulling the copied chromosomes towards the ends of the cell. Suggest why this drug stops the cells dividing.
The drug affects every cell in the body that is dividing quickly. Suggest one side effect the drug may cause, and give a reason for your answer.
63 exam-style questions on AQA GCSE Biology 1.2 Cell division, covering 1.2.1 Chromosomes, 1.2.2 Mitosis and the cell cycle, and 1.2.3 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.