The yeast-cell envelope contains a plasma membrane, a periplasmic space and a cell wall consisting mainly of polysaccharides with a small amount of peptide material.

• 认为这种絮凝是由于钙离子和细胞壁羧基集团搭建的盐桥而形成的。该细胞壁是一种半硬质，但可溶的有透过性的结构，能够赋予酵母相当的抗压和抗张强度。