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Q.
Length of one loop of B-DNA is
Biomolecules
Solution:
$ B-DNA$ is an antiparallel double helix. The double strand or duplex is coiled plectonemically in right handed fashion around a common axis like a rope stair case twisted in a spiral. The coiling produces alternate major and minor grooves. One turn of $360^{\circ}$ of the spiral has about 10 nucleotides on each strand of $DNA$. It occupies a distance of about $3.4 \,nm$ $(34 \,\mathring{A})$ i.e., pitch of $DNA$ is $34 \,\mathring{A}$ so that adjacent nucleotides or their bases are separated by a space $0.34 \,nm\, (3.4 \,\mathring{A})$.