Unlike DNA, which typically forms a helical structure, different molecules of RNA can fold into a variety of three-dimensional shapes.This is largely because RNA

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Unlike DNA, RNA is single-stranded which allows it to fold into a variety of different three-dimensional shapes. This is because it can base-pair with itself and form secondary structures such as hairpins, loops, and bulges. The other choices given do not directly explain why RNA can fold into different shapes.

Unlike DNA, Which Typically Forms a Helical Structure, Different Molecules