(A) In a $DNA$ double helix structure,the distance between two adjacent base pairs is approximately $0.34 \ nm$ (or $3.4 \ \mathring{A}$).This distanc

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(A) In a $DNA$ double helix structure,the distance between two adjacent base pairs is approximately $0.34 \ nm$ (or $3.4 \ \mathring{A}$).This distance is a fundamental characteristic of the $B-DNA$ form,which is the most common form of $DNA$ found in living organisms.Therefore,the correct option is $A$.