PAS does not stain:: (A) Fungal cell wall, (B) Basement membrane of bacteria, (C) Glycogen, (D) Lipids
Answer is D. PAS Stain in used for glycogen and mucopolysaccharide containing structures. There are 2 type of PAS positivity (a) Diastase sensitive PAS+VE It occurs is I Ewing sarcoma II Primitive neuro ectodermal tumors III Glycogen storage disease IV Seminoma V Embryonal rhabdo myosarcoma (b) Diastase Resistant PAS +ve I alpha one antitrypsin Deficiency II alveolar soft pa sarcoma