NEET 2019 · Class 11

Biological Classification

Mad cow disease in cattle is caused by an organism which has : (NEET 2019)

  1. (A)Free DNA without protein coat
  2. (B)Inert crystalline structure
  3. (C)Abnormally folded protein
  4. (D)Free RNA without protein coat

The NCERT line that answers it

Verbatim line

In modern medicine certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein.

Chapter
Biological Classification
Section
2.6 VIRUSES, VIROIDS, PRIONS AND LICHENS
Page
11
Words matched
43 of 48

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that mad cow disease (BSE) is caused by prions, which are 'an agent consisting of abnormally folded protein,' directly matching option C and distinguishing it from the other options.

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Question text is reproduced from the published NEET 2019 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.