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.
This difference is related to the greater radioactivity of rocks in the past as a consequence of the higher content of radioactive elements (mainly and) and also, probably, to transuranium elements that have since disappeared entirely. Liubimova, E. A. Termika Zemli i Luny.Moscow, 1968.his difference is related to the greater radioactivity of rocks in the past as a consequence of the higher content of radioactive elements (mainly and) and also, probably, to transuranium elements that have since disappeared entirely. Liubimova, E. A. Termika Zemli i Luny.