The smallest organisms are composed of only a single cell while the largest are made up of billions of cells. Even when comparing the most diverse and complex organisms, at the cellular level they are remarkably similar. Even though the human body has over 100 different cell types, they all share certain features and they even have many characteristics in common with plants. C. Prokaryotes perform most of the metabolic functions that Eukaryotes do but the reactions do not take place in distinct compartments called organelles .
Prokaryotes have an outer plasma membrane and some also have a cell wall.
The majority of organisms are Eukaryotes. A. Cell wall prevents the cell from being ruptured due to enlargement from water intake by vacuole. Helps keep plants erect. B. Cell plays an important role in absorption, transport and secretion of many substances C. Cell walls may have two or more layers and may vary in thickness depending on their role in the plant. Primary wall - deposited before and during growth of the cell.