Class 11 · Biological Classification

Prions: Protein Agents of Disease — NEET Biology

🔥 Predicted for NEET 2027
📖 NCERT Source

Prions: In modern medicine certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein. The agent was similar in size to viruses. These agents were called prions. The most notable diseases caused by prions are bovine spongiform encephalopathy (BSE) commonly called mad cow disease in cattle and its analogous variant Creutzfeldt-Jacob disease (CJD) in humans.

NCERT Biology · Class 11 · Chapter 2 · Paragraph 54
Why This May Be Tested in NEET 2027

Adjacent to a frequently-asked paragraph in the same chapter.

Practice This Concept
QuestionPredicted for NEET 2027

Why are viroids considered more primitive than viruses?

📖 Solution & NCERT Explanation
View solution & NCERT explanation

Correct answer: D They lack capsid and consist only of naked RNA

Viroids are just small, naked RNA molecules without any protein coat.

❓ Frequently Asked Questions
What does NCERT say about Prions modern medicine certain?
Prions: In modern medicine certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein. The agent was similar in size to viruses.
Has this concept appeared in NEET?
High probability for NEET 2027. Adjacent to a frequently-asked paragraph in the same chapter.
Which chapter is this from?
Biological Classification, Class 11 NCERT Biology.

Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.

176/180
of the ReNEET 2026 paper (all subjects) was already in the MedicNEET question bank

MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.

176 of 180 ReNEET 2026 questions traced to MedicNEET17,000+ Biology questionsHindi + English
Free to start · Hindi + English · 43,000+ questions · NEET 2026 pattern
Related Concepts from Biological Classification
📘Practice all 18 NEET PYQs from Biological Classification🔍See full Biological Classification PYQ Analysis