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Word organism microscope cell cell theory unicellular multicellular organelle mitochondrion vacuole reproduce / reproduction spontaneous generation stimulus (stimuli) stimulus response cell membrane nucleus eukaryote cytoplasm endoplasmic reticulum ribosome Golgi body lysosome cell wall chloroplast prokaryote autotroph heterotroph homeostasis Definition Synonym a living thing living an instrument that makes small objects look larger scientific tool basic unit of structure and function in living things building block a widely accepted explanation of the relationship between cells and living things cell = life a type of organism that is made up of one cell single an organism made up of many cells multiple a tiny cell structure that carries out a specific function in a cell organ a rod-shaped cell structure that produce most of the energy needed to carry out the cell's functions powerhouse a water-filled sac inside a cell that acts as a storage area storage the production of offspring that are similar to the parents offspring the mistaken idea that living things arise from nonliving sources instant life a change in an organism's surroundings that causes it to react cause an action or change in behavior cause by a stimulus effect the outside boundary of a cell, which can control which substances enter and leave a cell boundary the control center of a cell that directs the cell's activities control center an organism whose cells have a nucleus nucleus the region of the cell located inside of the cell membrane and outside of the nucleus (when present) jelly-like a maze of passageways inside of the cell that carries proteins from one part of a cell to another tunnels a tiny structure in the cell that makes proteins protein maker a structure in a cell that receives proteins and other materials, packages them, and ships them to other parts of the cell packaging plant a round structure in a cell that contains chemicals that break down large food particles into smaller ones digestion a rigid layer of nonliving material that surrounds the cells of plants and some other organisms structure a structure in the cells of plants and some other organisms that captures energy from the sunlight and uses it to produce food green an organism whose cells lack a nucleus no nucleus an organism that makes its own food makes food an organism that cannot make its own food eats others maintaining a stable environment in spite of changes in the external environment stable