What color is the basement membrane when stained?

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Prepare for the Epithelial Tissue Structure and Function Test. Explore with multiple choice questions and explanations. Master epithelial tissue concepts for your exam success!

Multiple Choice

What color is the basement membrane when stained?

Explanation:
Carbohydrate-rich components in the basement membrane—glycoproteins and proteoglycans—are highlighted by the Periodic Acid-Schiff (PAS) stain. The PAS reaction creates a magenta color where these carbohydrates are abundant, so the basement membrane appears magenta. Stains that color collagen blue or lipids green don’t target the carbohydrate-rich basement membrane in this context, and protein-focused stains wouldn’t give the characteristic magenta seen with PAS.

Carbohydrate-rich components in the basement membrane—glycoproteins and proteoglycans—are highlighted by the Periodic Acid-Schiff (PAS) stain. The PAS reaction creates a magenta color where these carbohydrates are abundant, so the basement membrane appears magenta. Stains that color collagen blue or lipids green don’t target the carbohydrate-rich basement membrane in this context, and protein-focused stains wouldn’t give the characteristic magenta seen with PAS.

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