C3. All cells have a lipoprotein cell membrane. In eukaryotic cells it is attached to the cytoskeleton.
C3.1 Describe the structure and function of the cell membrane in terms of the fluid mosaic model.
C3.2 Describe the role of the membrane in endocytosis and exocytosis.
C3.3 State three functions of the cytoskeleton.
C4. The intracellular environment of cells differs in composition from the extracellular environment of cells.
C4.1 Know that the proportions of chemicals in the intracellular environment of cells are different from those in the extracellular environment of cells.
C4.2 Understand why the internal composition of the cell is regulated.
C4.3 Explain how selective exchange occurs at the cell membrane.
C5. Movement of substances across membranes may be passive or require the expenditure of energy.
C5.1 Understand that the movement of substances by diffusion and osmosis is passive.
C5.2 Understand that the active transport of substances against the concentration gradient requires energy. This energy is supplied by ATP.