Botany-DNA Structure
NEET Botany DNA Structure MCQ Question
Type: MCQ-diagram based-Easy-Class 12
In a diagram of the DNA double helix, which feature is responsible for maintaining a constant distance between the two polynucleotide chains?
A
Hydrogen bonds between base pairs
B
Phosphate backbone structure
C
Base pair stacking
D
Purine and pyrimidine pairing
Correct Answer
Option D
Detailed Explanation
The distance between two polynucleotide chains in DNA remains almost constant due to the specific pairing of purines with pyrimidines, which ensures uniformity in width.
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