NEET 1991 · Class 12

Molecular Basis of Inheritance

A nucleotide is formed of

  1. (A)purine, pyrimidine and phosphate
  2. (B)purine, sugar and phosphate
  3. (C)nitrogen base, sugar and phosphate
  4. (D)pyrimidine, sugar and phosphate

The NCERT line that answers it

Verbatim line

A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group.

Chapter
Molecular Basis of Inheritance
Section
5.1.1 Structure of Polynucleotide Chain
Page
1
Words matched
24 of 24

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 'A nucleotide has three components – a nitrogenous base, a pentose sugar... and a phosphate group', which directly matches option C and distinguishes it from options using 'purine' or 'pyrimidine' instead of the broader 'nitrogen base'.

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 1991 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.