Eukaryotic cells have a nucleus and other membrane-bound compartments.
The size of cells is limited by suface area to volume ratio, which determines the efficiency with which materials and information are transported between the cell's interior and exterior. Complete understanding that except for bacteria, organisms consist of one or more eukaryotic cells that contain membrane-bound organelles. Smaller cells are more efficient that larger cells because it takes less time to transport information and materials across the surface to the inside where they are needed. Engage the Learner Divide the class into groups of 3-5 students. Have the groups make lists of the things they think of as the functions of life.