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Q.
$B-DNA$ which is right-handed double helix contains ____ base pairs per turn of the helix and each turn is ____ long.
Biomolecules
Solution:
In $B-DNA$, one turn of the helix has about $10$ nucleotides on each strand of $DNA$. A turn occupies a distance of about $3.4\, nm$ $(34\mathring{A}$ or $3.4 \times 10^{-9}\, m)$ so that adjacent nucleotides or their bases are separated by a space of about $0.34\, nm \,(0.34 \times 10^{-9}\, m$ or $3.4\, \mathring{A})$.