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Watch this video that shows a 3D model of the double helix structure of a DNA molecule. Think of the similarities and differences between DNA and RNA, both in their physical structure and their functions within eukaryotic cells.
Source: Howard Hughes Medical Institute BioInteractive, https://youtu.be/7vMaAQ6zb7g This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License.