4.Briefly answer the following questions.(5 point each,30 points in total) (1)What are the main functions of cell membrane in prokaryotic microorganisms? 1)Permeability barrier prevents leakage and function as gate way for transport of nutrients into and out of the cell. 2)Protein anchor site of many proteins involved in transport,bioenergetics,and chemotaxis. 3)Energy conservation site of generation and use of the proton motive force. (2)What are the three components of nucleotide?Please draw the schematic structure of nucleotide Phosphate Nitrogenous base Pentose sugar4 4. Briefly answer the following questions. （5 point each，30 points in total） (1) What are the main functions of cell membrane in prokaryotic microorganisms? 1) Permeability barrier prevents leakage and function as gate way for transport of nutrients into and out of the cell. 2) Protein anchor site of many proteins involved in transport, bioenergetics, and chemotaxis. 3) Energy conservation site of generation and use of the proton motive force. (2) What are the three components of nucleotide? Please draw the schematic structure of nucleotide. Phosphate Nitrogenous base Pentose sugar