细菌的生长和繁殖:二分裂法-无性繁殖 (Binary fission) 代时( generation time) 1 to 2 to 4 to 8 to n 多数病原菌为20~30mn Cell wall 结核分枝杆菌需18~20h Cell membrane Elongated nucleoid Nucleoid divides 可无穷繁殖? cell wall and membrane begin to form transverse septum Transverse septum becomes complete Daughter cells separate细菌的生长和繁殖：二分裂法-无性繁殖 （Binary fission） 1 to 2 to 4 to 8 to N 代时(generation time)： 多数病原菌为20~30 min 结核分枝杆菌需18～20h 可无穷繁殖？