The Cell Theory 1. All living things are made of cells. 2. Cells are the basic units of life. 3. Cells come only from other cells. Protocells: One theory of the origins of cells states that the first life on earth consisted of several types of tiny protocells, cell-like organisms. These organisms were able to survive and reproduce in a very limited environment because of their simplicity. Over time, some of these protocells came together and shared their …showed first 75 words of 610 total…

…showed last 75 words of 610 total…a cell. „h Large organells scattered through most cells, they are most numerous in cells that use a lot of energy like liver and muscle cells. Lysosome „h Digestive centers of a cell. „h They produce many different types of enzymes and digest things from food particles to a cell's own worn out parts. Vacuole „h Most common in plant cells, they are storage sites within a cell. Plastid „h Pigment producing organelle in cells.