DNA spiral as a Golden Section 1
It has been reported but not yet confirmed by this site that a cross-sectional view from the top of the DNA double helix forms a decagon:
A decagon is in essence two pentagons, with one rotated by 36 degrees from the other, so each spiral of the double helix must trace out the shape of a pentagon.
Pentagons are based on phi, the golden ratio
Construction of a decagon using two pentagons based on phi, the golden ratio
The ratio of the diagonal of a pentagon to its side is Phi to 1. So, no matter which way you look at it, even in its smallest element, DNA, and life, is constructed using phi and the golden section!