The PAS reaction will demonstrate fungi because the cell wall contains which component?

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Multiple Choice

The PAS reaction will demonstrate fungi because the cell wall contains which component?

Explanation:
The PAS reaction detects carbohydrates. Periodic acid oxidizes vicinal diols in polysaccharides to aldehydes, which then react with Schiff reagent to give a magenta color. Fungal cell walls are rich in carbohydrate polymers such as chitin and beta-glucans, so fungi appear PAS-positive in tissue sections. Lipids, proteins, and nucleic acids are not the primary substrates for the PAS reaction in this context, so they don’t produce the characteristic strong PAS signal seen with fungi.

The PAS reaction detects carbohydrates. Periodic acid oxidizes vicinal diols in polysaccharides to aldehydes, which then react with Schiff reagent to give a magenta color. Fungal cell walls are rich in carbohydrate polymers such as chitin and beta-glucans, so fungi appear PAS-positive in tissue sections. Lipids, proteins, and nucleic acids are not the primary substrates for the PAS reaction in this context, so they don’t produce the characteristic strong PAS signal seen with fungi.

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