基本结构:细胞壁、细胞膜 、细胞质和原核,为所有 形体微小 m级:光镜可见 nm级:电镜可见 The white bar above represents 10 microns (0.01mm). Below are some organisms and cells drawn to approximate scale. virus(0.05 to 0.1 microns) bacteria (0.5 to 1.5 microns) red blood cell (5 microns) lymphocyte (5 to 8 microns) human sperm (60 microns) 简 结构简单