STANDARDZoology-Molecular Basis of Inheritance
STANDARD Zoology Structure of DNA MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Which of the following is not relevant to the structure of double helical DNA
A
The helix makes one complete spiral turn every 34 Å
B
The diameter of the helix is 20° Å
C
The distance between adjacent nucleotide is 3.4 Å
D
Each strand of helix has a backbone made up of alternating ribose sugar and phosphate
Correct Answer
Option B
Detailed Explanation
The diameter of the DNA helix is approximately 20 Å, not 20° Å. The other options correctly describe the structural features of DNA.
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