Stay Woke, a documentary about the rise of the Black Lives Matter movement, will premiere Thursday on BET. Photo: David McNew/Getty Images Even the most casual social media user has almost certainly seen references to the slang term woke, as in stay woke.
The major lethal lesions are pyrimidine dimers in DNA (produced by UV-B and UV-C)--these are the result of a covalent attachment between adjacent pyrimidines in one strand. This is shown here for a thymine-thymine dimer and here for a thymine-cytosine dimer. third type of spontaneous DNA damage that occurs frequently is damage to the bases by free radicals of oxygen. These arise in cells as a result of oxidative metabolism and also are formed by physical agents such as radiation.
Purines are one of two families of nitrogen-containing molecules called nitrogenous bases. Pyrimidines are the other family of nitrogenous bases. Nitrogenous bases are needed to construct the genetic material in every living organism.