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GCSE Biology · key term
The basic building block of a living organism; cells carry out the processes needed for life.
Used by AQA
Specification 4.2.1, 4.8 · Paper 1, Paper 2
Revise: Organisational PrinciplesEvery living organism is made from cells. A cell is the basic building block of life: it is a small unit containing the structures needed to carry out living processes. Some organisms consist of just one cell.
The smallest structural and functional unit of a living organism.
Use the precise hierarchy: cell → tissue → organ → organ system → organism.
Do not define an organ as merely a group of cells: it contains different tissues working together to perform a specific function.
Keep the levels of organisation in the correct order: cell → tissue → organ → organ system → organism.
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