Let's start by taking a closer look at the structure of DNA (deoxyribonucleic acid).
First it is important to note that the structure of DNA is the same in all organisms. If you think back to Week 3, we talked about nucleic acids being one of the important building blocks of life in biology. We said that nucleic acids have a phosphate group, a sugar (deoxyribose in the case of DNA) and a nitrogen base.
To read more about the structure of DNA go to the DNA from the Beginning page, DNA molecule is shaped like a twisted ladder. On this page, read the information on the Concept tab. Then click on the Animation tab, on that tab use the next arrow at the bottom of the image, to read through the work that Watson and Crick completed during their work on DNA structure. Take notes on your reading, as you go through the animation. There will be a short quiz on the next page.