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Cell: The smallest unit (part) of an organism Tissue: A group of cells that work together to perform a specific job in the body Organ: A group of tissues that work together to perform a specific job in the body Organism: Anything that can live on its own Unicellular: An organism that is made up of only one cell Multicellular: An organism that is made up of multiple cells Population: A group of organisms that are of the same kind and that live in the same area Community: Two or more populations living in the same area Ecosystem: The community and all of the nonliving things that affect it, such as water, soil, rocks, temperature, and light Cell Membrane: A layer that covers a cell’s surface and acts as a barrier Cell Wall: A structure that surrounds the cell membrane of some cells and provides strength and support to the cell membrane Nucleus: The membrane-covered organelle found in eukaryotic cells that contain the cell’s DNA and serves as the control center for the cell Ribosome: A small organelle in cells where proteins are made from amino acids Endoplasmic Reticulum: A membrane-covered cell organelle that produces lipids, breaks down drugs and other substances, and packages proteins for delivery out of the cell Mitochondria: Cell organelles surrounded by two membranes that break down food molecules to make ATP (energy) Chloroplast: An organelle found in plant and algae cells where photosynthesis occurs Golgi Complex: The cell organelle that modifies, packages, and transports materials out of the cell Vesicle: A membrane-covered compartment in a eukaryotic cell that forms when part of the cell membrane surrounds an object and pinches off Vacuole: a large membrane-covered structure found in plant cells that serves as a storage container for water and other liquids Lysosomes: Special vesicles in animal cells that contain enzymes, and are used to digest food particles, wastes, cell parts, and foreign invaders