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GCSE Combined Science · key term
A layer outside the cell membrane that strengthens a cell; in plant and algal cells it is made of cellulose.
Used by AQA and Edexcel
Specification 4.1.1.1, 4.1.1.2 · Paper 1
An outer layer surrounding the cell membrane in bacterial cells and some eukaryotic cells, including plant cells.
Revise: Eukaryotes and prokaryotesBacterial cells are prokaryotic cells. They have cytoplasm and a cell membrane, with a cell wall surrounding the membrane. They are much smaller than typical plant and animal cells.
Paper 1, Paper 2
A strong layer outside the cell membrane that supports the cell. Plant cell walls are made of cellulose.
Revise: Cell Structures and Specialised CellsA cell wall lies outside the cell membrane. It is made of cellulose and provides strength and support. The wall and membrane have different roles: the wall supports the cell, while the membrane controls the movement of substances.
Distinguish the cell membrane, which controls movement of substances, from the cellulose cell wall, which strengthens plant and algal cells.
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