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  4. In the double-helical structure of DNA, the pitch of the helix is

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Q. In the double-helical structure of DNA, the pitch of the helix is

KEAMKEAM 2015Molecular Basis of Inheritance

Solution:

In B-DNA, one turn of the spiral has about 10 nucleotides on each strand of DNA. It occupies a distance of about 3.4 nm $(34\mathring{A})$ so that adjacent nucleotides or their bases are separated by a space of about 0.34 nm $(3.4 \mathring{A})$.