MutationsThe replication process of DNA is extremely accurate; however, errors can occur when nucleotide bases between DNA strands are occasionally paired incorrectly. In addition, errors in DNA molecules may arise as a result of exposure to radiation (such as ultraviolet or X-ray) or various reactive chemicals. When errors occur, repair mechanisms are available to make corrections.If a DNA error is not repaired, it becomes a mutation. A mutation is any sequence of nucleotides in a DNA molecule that does not exactly match the original DNA molecule from which it was copied. Mutations include an incorrect nucleotide (substitution), a missing nucleotide (deletion), or an additional nucleotide not present in the original DNA molecule (insertion). When an insertion
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DNA repair, RNA molecules, original DNA molecule, mutagens. Mutagens