cell, the smallest functional unit in an organism the building block of life, cytoplasm, a jelly like substance found in cells, where all the chemical reactions take place, cell membrane, the cell component that controls which substance can move into and out of the cell, nucleus, the cell component (organelle) that controls the cell and contains genetic material, mitochondria, the cell component (organelle) where respirations takes place, cell wall, the plant cell component that surrounds the cell, providing support, vacuole, the plant cell component that contains cell sap and helps to keep the cell firm, chloroplasts, the plant cell component (organelle) where photosynthesis takes place.

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