DNA is not a 3D molecule. DNA is a molecule which can be represented as 3D. It can just as easily be represented with one or even two fewer dimensions without losing any information.
By the holographic principle, there may be no such thing as "3D" except as a concept for conscious minds to make sense of reality.
By the holographic principle, there may be no such thing as "3D" except as a concept for conscious minds to make sense of reality.