The role of tautomerism in causing mutations relates to the fact that the process ultimately affects the nitrogenous base nitrogenous base . A) covalent bonding affinities of the . B) hydrogen bonding affinities of the C) deoxyribose sugar . D) ability of DNA to replicate at all . E) phosphate group . Which of the following chemicals is a base analog? » A. Nitrous acid » B. 5-bromouracil ° C. Ethyl methane sulfonate D. Nitrogen mustard ·E, AZT . What is the minimum number of single- nucleotide substitutions that would be necessary for the replacement of amino acid methionine with tyrosine?

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