M2 C5 Biological Membranes

Question 1

what is the role of the membrane [3]

Answer 1

• to act as partially permeable barriers between
  
  • the cells and their environment
  • organelles and the cytoplasm
  • within organelles
• to be the sites of chemical reaction
• to be sites of cell communication (cell signalling)

Question 2

explain the structures in cell membranes and their functions

Answer 2

cholesterol
carrier protein
phospholipids