Consideration of tautomerism in guanine suggests that it can exist in lactam and lactim forms.The form that is typically found in DNA is __________,typically pairs with _____________,while the other form is likely to pair with __________,leading to the possible spontaneous mutations.

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Guanine typically exists in the lactam form in DNA, where it pairs with cytosine. The lactim form can lead to mispairing, potentially with thymine, causing mutations.

Consideration of Tautomerism in Guanine Suggests That It Can Exist