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.
Radioactivity. The different isotopes of an element have identical chemical properties. Some isotopes, however, are radioactive. This means that they give out radiation from their nuclei. This happens all the time, whatever is done to the substance.For example, the radiation is still given out if the substance is cooled down in a freezer, or takes part in a chemical reaction. Page: 1  1. 2  2. 3  3. 4  4. 5  5.adioactivity. The different isotopes of an element have identical chemical properties. Some isotopes, however, are radioactive. This means that they give out radiation from their nuclei. This happens all the time, whatever is done to the substance.