A, the mutual transformation of cell biofilm should be based on its fluidity, and A is wrong;

B, the cell membrane permeability of aging cells increased, but the selectivity decreased, the cell membrane transport capacity decreased, and the glycoprotein content in cancer cell membrane decreased. B is correct;

C, Golgi membrane and endoplasmic reticulum membrane are indirectly related in structure, which is C error through vesicle transformation;

D. The specific immune system recognizes itself and non-ego through molecules on the cell membrane surface, and D is correct.

So: BD.