NEET 2008 · Class 12

Molecular Basis of Inheritance

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

  1. (A)Guanine, Adenine - Purines
  2. (B)Adenine, Thymine - Purines
  3. (C)Thymine, Uracil - Pyrimidines
  4. (D)Uracil, Cytosine - Pyrimidines

The NCERT line that answers it

Verbatim line

There are two types of nitrogenous bases – Purines (Adenine and Guanine), and Pyrimidines (Cytosine, Uracil and Thymine).

Chapter
Molecular Basis of Inheritance
Section
5.1.1 Structure of Polynucleotide Chain
Page
1
Words matched
17 of 17

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 'Purines (Adenine and Guanine)' and 'Pyrimidines (Cytosine, Uracil and Thymine)', which directly shows that Thymine is a pyrimidine, not a purine, making option B wrong.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Take the free 5-minute checkMore from this chapter

Question text is reproduced from the published NEET 2008 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.