25.2 Oligosaccharides are added to proteins in the er and golgi 句f mannose-6-P receptors sialyl transferase Figure 25. 7 A Golgi acid phosphatase stack consists of a series galacto sy tran sferase F rans cistern of cisternae organized with cis to trans polarity 1P-NAc-qlucosaminidase NADPase mediakeisterna Protein modifications mannosidase‖l occur in order as a gIcN-acetyl-transferase mannosidase I as cisterna protein moves from the Golgi: c isease cis face to the trans face 消当Figure 25.7 A Golgi stack consists of a series of cisternae, organized with cis to trans polarity. Protein modifications occur in order as a protein moves from the cis face to the trans face. 25.2 Oligosaccharides are added to proteins in the ER and Golgi