Question: what is a major difference between the structure of a cell wall and a cell membrane?
Answer: Plasma membrane is made up of lipids proteins and small amount of carbohydrates. Cell wall is a rigid, thick structure (4-20 uM) and visible in light microscope. Cell membrane is delicate, thin structure (5-10 nm wide) visible only in electron microscope. Cell wall is completely permeable to ordinary macromolecules .