In the DNA ligase reaction, the lysine residue:
A. serves as the nucleophile displacing the phosphate group 3' to the nicked site.
B. serves as the electrophile displacing the phosphate group 3' to the nicked site.
C. remains phosphorylated after the ligase reaction.
D. serves as a nucleophile, which displaces the pyrophosphate from ATP.
E. remains bound to AMP, ready to repeat the reaction.
D
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