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STAAR Review—CELLS & KINGDOMS—CATEGORY 4 The Cell Theory states that: All living things are composed of cells. The cell is the basic unit of life. Cells arise from pre-existing cells. key Terms: Prokaryotic: Cells that lack a nucleus Eukaryotic: Cells that contain a nucleus Autotrophs: Organisms that capture and store energy from the sun to produce their own food; also called producers. Heterotrophs: Organisms that obtain their energy from the food they consume; also called consumers. Unicellular: Composed of a single cell Multicellular: Composed of many cells Asexual reproduction: Production of new organisms from one parent Sexual reproduction: Production of new organisms from two parents Two Key Types of Cells (Animal and Plant): Much bigger in plant cells! Key Reminders: Plant cell diagrams are generally rectangular in shape, while animal cell diagrams are more circular. Key differences between plant cells and animal cells: Plant cells have chloroplasts which contain chlorophyll. Plants contain cell walls. A plant cell vacuole is much larger than vacuoles in animal cells. Organisms can be classified into one of 6 Kingdoms: Animalia: Multicellular, eukaryotic, heterotroph, mainly sexual reproduction Plantae: Multicellular, eukaryotic, autotroph, asexual or sexual reproduction; Cell wall of cellulose Fungi: Multicellular, eukaryotic, heterotroph, asexual or sexual reproduction; Cell wall of chitin; Examples include mold and fungus Protista: Unicellular, eukaryotic, autotroph or heterotroph; asexual or sexual reproduction; Found in moist or wet areas like ponds; Cells walls made of cellulose; Examples include algae, paramecium, amoeba, euglena Archae: Unicellular, prokaryotic, autotroph or heterotroph, asexual reproduction; Live in extreme conditions Bacteria: Unicellular, prokaryotic, autotroph or heterotroph, asexual reproduction; Examples include E.coli and strep