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(A) Base analogues are chemical compounds that structurally resemble the nitrogenous bases of $DNA$ (purines and pyrimidines). Because of their struct

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Base analogues

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(A) Base analogues are chemical compounds that structurally resemble the nitrogenous bases of $DNA$ (purines and pyrimidines). Because of their structural similarity,they can be incorporated into the $DNA$ molecule during replication in place of normal bases. Once incorporated,they often undergo tautomeric shifts,leading to incorrect base pairing during subsequent rounds of replication,which results in spontaneous mutations.

Mutagens that are effective in inducing spontaneous $DNA$ mutations are .....

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