A culture begins with 80 cells. All cells complete one cell cycle every 4 hours. After 8 hours, 25% of the cells are removed. The remaining cells complete one more cycle. No cells die.
How many cells are present after 12 hours?
240 cells
480 cells
600 cells
640 cells
42 exam-style questions on Edexcel GCSE Biology 2.1 Cell division and growth, covering 2.1.1 Mitosis and the cell cycle, 2.1.2 Division producing identical daughter cells, 2.1.3 Cancer and uncontrolled cell division, 2.1.4 Growth in animals and plants, 2.1.5 Importance of cell differentiation, and 2.1.6 Percentile charts to monitor growth. Each one has a worked solution and a mark scheme showing where the marks go.