- Cells are the building blocks of an organism.
- Unicellular organisms are made up of only one cell, for example bacteria.
- Multicellular organisms are made up of lots of cells, for example a human.
Cell Structure
- Cells may look different but they have the same basic structure.
- Most cells have the following structures: cell membrane, cytoplasm, nucleus, small vacuole and mitochondrion.
- Plant cells have extra structures: chloroplasts, cell wall and large vacuole.
Functions of the Cell Organelles
Cell membrane: holds the cells together and controls what can enter and leave the cell.
Cytoplasm: watery fluid that holds the organelles in place.... (More)