Which of the following is NOT listed as PAS positive in the material?

Prepare for the Histotechnologist Certification Exam with our comprehensive study material. Use flashcards, detailed explanations, and intuitive multiple-choice questions. Boost your test readiness and achieve certification success!

Multiple Choice

Which of the following is NOT listed as PAS positive in the material?

Explanation:
PAS staining targets carbohydrates. Periodic acid converts vicinal diols in sugars into aldehydes, which the Schiff reagent then colors magenta. This means structures rich in carbohydrates—glycogen, neutral mucins, and fungal cell walls—show a PAS-positive reaction. Collagen, on the other hand, is a protein with little carbohydrate content, so it does not typically stain with PAS under routine conditions. That’s why collagen is the correct choice for “not listed as PAS positive.”

PAS staining targets carbohydrates. Periodic acid converts vicinal diols in sugars into aldehydes, which the Schiff reagent then colors magenta. This means structures rich in carbohydrates—glycogen, neutral mucins, and fungal cell walls—show a PAS-positive reaction. Collagen, on the other hand, is a protein with little carbohydrate content, so it does not typically stain with PAS under routine conditions. That’s why collagen is the correct choice for “not listed as PAS positive.”

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy