MCQ practice · SSC Biology Board questions · Chapter 12: Heredity in Organisms and Biological Evolution
What is the length of each turn of the DNA helix?
Think it through first, then pick an option.
- a 24 Å
- b 28 Å
- c 34 Å
- d 36 Å
Answer and explanation
Correct answer: c 34 Å
In the book each complete turn of the DNA helix is 34 Å long.
Why the other options are wrong
- a 24 Å: Not 24 Å; one complete turn is 34 Å long.
- b 28 Å: Not 28 Å; one complete turn is 34 Å long.
- d 36 Å: Not 36 Å; one complete turn is 34 Å long.
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