The diameter of the alpha helix structure of DNA is 2nm, the diameter after having wrapped around the first histone is 11nm. That string wraps around another histone forming a 30nm chain, and so forth until you reach the chromasomal structure of roughly 700nm.
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Double Helix
Probably another DNA molecule. But even then there will be monior differences. So I suggest there is nothing that is the same shape.
"Spiral" is a general term describing a circular pathway in space. Without getting into mathematical formulas to describe the different types of spirals suffice it to say that, at the high school level, a spiral, as in the case of a whirlpool, can be seen to have a decreasing diameter along the medial axis of the spiral. In contrast, the diameter of a helix, such as a DNA molecule, is uniformly constant. Wrap a wire around a cone and then remove the cone; the shape of the wire is representative of a spiral. Wrap a wire around a cylinder and then remove the cylinder; the shape of the wire is representative of a helix. Pakrutoy
You do a diameter circle!!
It is half of the diameter or radius = diameter/2