With the DNA pinned in place, it is straightforward to trace the motion of fluorescently-labelled proteins under a microscope and view their activity ... to unwind the helix and make it longer ...

Later it was found that the sugar in nucleic acid can be ribose or deoxyribose, giving two forms: RNA and DNA ... in a helix as Franklin had found, but one going up and the other going down.

Here, travel into the tiny world of DNA, all the way down to the level of the atoms ... around a core of histones. Here is a view of the double helix -- the subject of Rosalind Franklin's Photo ...

The initiation of DNA replication occurs in two steps. First, a so-called initiator protein unwinds a short stretch of the DNA double helix ... makes its way down the unwound DNA strand, it ...