If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6×10^9 bp, then the length of the DNA is approximately :

NEET UG 2020 · Botany · Question 74

NEET 2020 Botany, question 74

Question 74 of the NEET 2020 paper (code E1) is a Botany question from Molecular Basis of Inheritance. Its idea, DNA Length Calculation, was asked twice, in 2020 and 2022, across NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q74 · Botany

6.6\times10^9

1 2.0 meters 2 2.5 meters 3 2.2 meters Official answer 4 2.7 meters

Official answer: option 3 · NTA final answer key

Same idea

DNA Length Calculation, in other papers

NEET asked this idea twice, in 2020 and 2022. The other question below.

2022 Q 171 If the length of a DNA molecule is 1.1 metres, what will be the approximate number of base pairs ? Numerical \cdot Easy

DNA Length Calculation: every question and how it was framed

The chapter

Molecular Basis of Inheritance in ten years of NEET

61 questions from 2017–2026, asked in 10 of 10 papers, about 5.8 a paper. DNA Double Helix alone had 16.

Chapter analysis Study this chapter Practise this chapter

DNA Length Calculation, in other papers

Molecular Basis of Inheritance in ten years of NEET

Molecular Basis of Inheritance: questions per paper