The Cell Theory

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 …

…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.