![The shape of a strand of DNA, photographed with an electron microscope, can be described using mathematical knot theory. The shape of a strand of DNA, photographed with an electron microscope, can be described using mathematical knot theory.](https://i.pinimg.com/originals/ea/fd/46/eafd46f196d8f3f19f102d7d2e804cc6.jpg)
The shape of a strand of DNA, photographed with an electron microscope, can be described using mathematical knot theory.
![Under the electron microscope, DNA molecules undergoing transcription exhibit Christmas-tree-like structures. | Learn Science at Scitable Under the electron microscope, DNA molecules undergoing transcription exhibit Christmas-tree-like structures. | Learn Science at Scitable](https://www.nature.com/scitable/content/29586/pierce_13_3_FULL.jpg)
Under the electron microscope, DNA molecules undergoing transcription exhibit Christmas-tree-like structures. | Learn Science at Scitable
![Electron microscopic observation of DNA molecules in globular state.... | Download Scientific Diagram Electron microscopic observation of DNA molecules in globular state.... | Download Scientific Diagram](https://www.researchgate.net/publication/280920208/figure/fig1/AS:652607496388617@1532605160345/Electron-microscopic-observation-of-DNA-molecules-in-globular-state-Surfactant.png)
Electron microscopic observation of DNA molecules in globular state.... | Download Scientific Diagram
![DNA Microscopy: Optics-free Spatio-genetic Imaging by a Stand-Alone Chemical Reaction - ScienceDirect DNA Microscopy: Optics-free Spatio-genetic Imaging by a Stand-Alone Chemical Reaction - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0092867419305471-fx1.jpg)