A student recently wrote us: "The explanation is far-fetched. It is like saying because something is more representative, therefore it is right."
Although A and D could both represent ssDNA, the question states "...not another form of nucleic acid". Because of Chargaff's rule, double-stranded DNA has equal proportions of A's and T's as well as equal proportions of C's and G's. Therefore, answer choice A could either be dsDNA or ssDNA because its distribution follows Chargaff's rule. On the other hand, answer choice D does not follow Chargaff's rule and, therefore, must be ssDNA. "Representative" in this context simply means an "example of".
Thanks for your question. I hope this helps!
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