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Unit C Vocabulary magnification: to enlarge an image of an object cell: basic unit of structure and function of life unicellular: made of only ONE cell; bacteria multicellular: made of many cells; humans, trees, etc. prokaryotic: cells that DO NOT have membrane-bound structures; bacteria eukaryotic: cells that DO have membrane-bound structures; mammals cell membrane: the outer boundary of a cell; it allows some materials to pass through, but not all nucleus: structure near the center of the cell that controls the cell; includes DNA and chromatin; "the brain" cytoplasm: mostly water gel-like fluid that contains all the organelles in a cell cell wall (PLANTS ONLY): outer barrier for support; made of cellulose organelle: structures in the cytoplasm of a cell that carry out cell activities chloroplasts: It is a green organelle because it contains chlorophyll. This is where photosynthesis occurs. Chloroplasts are ONLY found in plant cells.