A) 2nm/20 \[Ao\]
B) 0.2nm/2 \[Ao\]
C) 3.4nm/34 \[Ao\]
D) 0.34nm/3.4 \[Ao\]
Correct Answer: C
Solution :
DNA is a double-stranded polynucleotide arranged in a double helix. The two strands are entwined around one another, each complete coil measures 3.4 nm (10 bases long). Each strand links to the other by pairs of organic bases, where the pairings are always cystosine with guanine and thymine with adenine. The two strands that form the uprights run antiparallel, ie, in opposite directions.
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