Botany-DNA Structure
NEET Botany DNA Structure MCQ Question
Type: MCQ-numerical-Hard-Class 12
If the total length of DNA in a single human cell is approximately 2.2 meters, calculate the approximate number of base pairs present in the DNA, given that the distance between two consecutive base pairs is 0.34 nm.
A
6.5 × 10⁹ bp
B
6.6 × 10⁹ bp
C
6.8 × 10⁹ bp
D
7.0 × 10⁹ bp
Correct Answer
Option B
Detailed Explanation
Using the formula: length of DNA = number of base pairs × distance between base pairs, we have 2.2 meters = number of base pairs × 0.34 nm. Converting 2.2 meters to nanometers (2.2 × 10⁹ nm), the calculation yields approximately 6.6 × 10⁹ base pairs.
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