role of membranes

Question 1

explain the functions of membranes within cells

Answer 1

• provide internal transport system
• selectively permeable to regulate passage of molecules into / out of organelles or within organelles
• provide reaction surface
• isolate organelles from cytoplasm for specific metabolic reactions

Question 2

explain the function of the cell surface membrane

Answer 2

• isolates cytoplasm from extracellular environment
• selectively permeable to regulate transport of substances
• involved in cell signalling / cell recognition