describe some mutation repair mechanisms

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Biology

describe some mutation repair mechanisms

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Following are the repair mechanism 1 Photoreactivation i Ultraviolet light is a physical mutagen and can induce mutation Ultra violet radiation 254 nm causes formation of pyrimidine dimers cyclobutane ring when two pyrimidine bases occurs together in single strand of DNA ii Thymine dimer is most common one but cytosine dimer as well as thyminecytosine may also occurs Thymine dimer is a state in which two adjacent thymine molecules are chemically joined distorting the structure of DNA so that impeding transcription and replication process iii This pyrimidine dimer formation is lethal to the cell unless it is corrected A repair mechanism known as photo reactivation can repair this mutation iv When UV radiated population of bacteria is subsequently exposed to visible light of wave length of 300450nm the survival rate increases and frequency of mutation decreases This is due to activation of photo reactivating enzyme photolyase which splits thymine dimer v In the dark the enzyme bind with thymine dimer and in presence of visible See Answer

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describe some mutation repair mechanisms

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describe some mutation repair mechanisms

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