The phosphate is linked to the 5' carbon of the sugar in both RNA and DNA. The nitrogenous bases are adenine(A), guanine(G), cytosine(C), thymine(T), and uracil(U). Adenine and guanine are purines (contains a six membered ring of carbon and nitrogen fused to a five membered ring). Adenine and guanine are both found in DNA and RNA.
Uranium is a naturally occurring weakly radioactive element. High levels of uranium in water may increase the risk of cancer and kidney damage. Most of the uranium that is ingested by food or drink by the human body is excreted, but some amounts are absorbed into the bloodstream and kidneys.
We measure the quantity of radioactivity in several different units, but they are all related to a single basic characteristic of radioactive materials-the rate at which they decay..This question calls for some discussion of some of the terms used to describe radioactivity.hen a radioactive atom goes through such a transition, it always changes to a more stable atom. We call this change a decay or disintegration, although the atom doesn't really disintegrate. The decay of radioactive material into stable material is also accompanied by the emission of ionizing radiation.