Flash Cards: write the word on one side and the definition on the other. Nucleus: coordinates cell activities and reproduction Nucleus: uses DNA to regulate cell activities and reproduction Rigid cell walls: provides support for plant cells Lysosomes: remove wastes from cell Cells: come from pre-existing cells; all organisms are made up of; smallest unit of life Mitochondria: produces energy for the cell Cytoplasm: made mostly of water, this is where cell organelles are located Unicellular: an organism made up of only one cell Cilia: hairlike projections that help unicellular organisms move Autotrophic: makes its own food Bacteria: prokaryotic Eukaryotic: contains membrane bound structures Prokaryotic: simple cell, does not contain membrane bound structures or a nucleus Flagellum: a whiplike structure that helps a unicellular organism move in water Heterotrophic: has to eat food for energy Homeostasis: maintaining a stable internal environment Producer: plants containing chloroplasts that make food Semi-permeable membrane: can control what enters and exits cell Structure: a part Function: the job it does