Using food and controlling growth

All organisms must respire in order to stay alive. Revise cellular respiration, the differences between between aerobic and anaerobic respiration, and how to calculate rates of respiration.

The development of microscopes, particularly the electron microscope, has helped scientists to learn more about how cells function.

Multicellular organisms grow by increasing the number of cells they have. This relies on the processes of cell division and differentiation.

Gain an in-depth understanding of mitosis with this interactive activity from Bitesize, written to the GCSE OCR 21st Century Combined Science specification.