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.
The purines are made up of two-carbon nitrogen ring bases with four nitrogen atoms while the pyrimidines are made up of one-carbon nitrogen ring bases with two nitrogen atoms. These two compounds serve as building blocks for a wide variety of organic compounds that can be found in nature and in our bodies.n microbiology, there are two types of nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA. These two types are called purines and pyrimidines.