Membrane carbohydrates Small amounts located at the extracellular surface in combination with membrane proteins or lipids glycoproteins or glycolipids Functions Negatively charged, let the cell to repel negative objects Attach cells one to another Acts as receptor substance for binding hormone such as Insulin Participate in immune reaction as antigen21 Membrane Carbohydrates: ➢ Small amounts ➢ located at the extracellular surface. ➢ in combination with membrane proteins or lipids ➢ glycoproteins or glycolipids. ➢ Functions: ➢ Negatively charged, let the cell to repel negative objects ➢ Attach cells one to another ➢ Acts as receptor substance for binding hormone such as insulin ➢ Participate in immune reaction as antigen