A tumour forms when

  1. cells stop dividing
  2. DNA is not replicated
  3. cell division becomes uncontrolled
  4. telomeres are too long
Answer

C) cell division becomes uncontrolled

Uncontrolled mitosis produces a tumour. AS & A Level Biology · Topic 5 The Mitotic Cell Cycle · 5.1 Replication and division of nuclei and cells

Biology MCQ · More A Level Biology: The mitotic cell cycle MCQs · Practise