NEET 1990 · Class 12

Molecular Basis of Inheritance

An octamer of 4 histones complexed with DNA forms

  1. (A)endosome
  2. (B)nucleosome
  3. (C)mesosome
  4. (D)centromere

The NCERT line that answers it

Verbatim line

The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called **nucleosome** (Figure 5.4 a).

Chapter
Molecular Basis of Inheritance
Section
5.1.2 Packaging of DNA Helix
Page
4
Words matched
34 of 34

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 DNA wrapped around a histone octamer forms a nucleosome, which directly matches the question's description and correct answer.

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 1990 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.