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A cell - is the basic unit of structure and function in all living things. is what all living things are made of comes from a preexisting cell A typical cell is microscopic contains DNA, cytoplasm, and a cell membrane is made up of smaller parts that help the cell grow, reproduce, respond, and use energy to carry out special jobs Organization of Living Things cell tissue - a group of similar cells working together organ - a group of different tissues working together to perform organ system special functions many organs working together organism - highest level of cell organization The structure of a cell relates to its function. Red blood cells are different from other cells. have a nucleus only when they are first formed lose nucleus as they mature must be flexible so they can enter tiny capillaries White blood cells are different from other cells. have extensions that grab, trap, and engulf harmful particles that have invaded the body bacteria