N (a)Rough endoplasmic reticulum 0.5m (b)Smooth endoplasmic reticulum 0.54m Figure 12-2 Rough and Smooth Endoplasmic Reticulum. studded with ribosomes(TEM).(b)Electron micrograph of smooth (aElctrn icrograph of endoplasmic reticulum.The rough ER is endoplasmic reticulum (TEM). 主讲：汤华主讲：汤 华