Many human skin tumors contain mutated p53 genes that probably result from excess UV exposure. One of 10 different equally likely mutations of the p53 gene always results from a single episode of excessive UV exposure; the 10 mutations remain equally likely over repeated exposures. A p53 gene must experience all 10 mutations before a tumor can develop. Assume that only one mutation can occur as a result of one excessive UV skin exposure. Question 2. How many excessive UV exposures would you expect are required until the p53 gene has experienced all 10 mutations

What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.