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CELL THEORY The Cell is the basic unit of life. All living things are composed of cells. Unicellular & Multicellular. All cells come from pre existing-cells Important Organelles In A Cell Nucleus- Contains the cell’s DNA. ‘Brain’ of the cell. Mitochondrion- Site of respiration. Provides the energy for the cell to function. Ribosomes- Site where proteins are made ( including enzymes). Vacuole- Storage. Cytoplasm- Watery fluid that all the cell organelles float. Unicellular Organisms- Made of only one cell. Multicellular- Made up of more than one cell eg. Humans. Microorganisms are, unicellular organisms that can be both beneficial & dangerous.