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DNA is unique among the options as it is double-stranded.
The characteristic that is unique to DNA among the given options is that it is double-stranded. DNA consists of two strands that are complementary to each other, running in opposite directions, forming the famous double helix structure.
While other options like using the base adenosine, having a phosphate backbone, and containing sulfur within the nucleotides are common characteristics of DNA, being double-stranded sets DNA apart from them.
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