NEET 1999 · Class 12

Molecular Basis of Inheritance

In DNA, when AGCT occurs, their association is as per which of the following pair?

  1. (A)AT-GC
  2. (B)AG-CT
  3. (C)AC-GT
  4. (D)All of these

The NCERT line that answers it

Verbatim line

The rule is that Adenine pairs with Thymine through two H-bonds, and Guanine with Cytosine through three H-bonds.

Chapter
Molecular Basis of Inheritance
Section
5.10 DNA FINGERPRINTING
Page
29
Words matched
18 of 18

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

How this line gives the answer

8333, emb=0.9695, combined=0.915). Verified: high — The span explicitly states 'Adenine pairs with Thymine' and 'Guanine with Cytosine', which directly corresponds to the AT-GC pairing rule asked in the question, distinguishing it from the incorrect options.

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 1999 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.