Question

The form of DNA with $34\mathring{A}$ pitch with a rise per base pair of $3.4\mathring{A}$ is called

• A. A-DNA
• B. B-DNA
• C. Z-DNA
• D. C-DNA

Answer 1

Answer: (B)

In one form of DNA, each DNA strand appears like a helical staircase and each step of ascent is represented by a pair of bases. At each ascent step, the pitch would be $34\mathring{A}$ and the rise per base pair would be $3.4\mathring{A}$. This form of DNA is called the $B$-DNA.