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  4. The form of DNA with 34 mathringA pitch with a rise per base pair of 3.4 mathringA is called

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

Biomolecules

Solution:

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.