Mutations that involve a single base substitu | vedclass

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(C) Mutations involving a single base substitution are known as point mutations.Ultraviolet $(UV)$ rays are a well-known physical mutagen.$UV$ radiati

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Ultraviolet rays

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(C) Mutations involving a single base substitution are known as point mutations.Ultraviolet $(UV)$ rays are a well-known physical mutagen.$UV$ radiation,particularly at a wavelength of $260 \ nm$,is absorbed by $DNA$,causing the formation of pyrimidine dimers (usually thymine dimers).These dimers can lead to errors during $DNA$ replication,resulting in base substitution mutations.

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