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Which molecule provides energy for T4 DNA ligase?

Answer and explanation

Correct answer: ATP

T4 DNA ligase is an ATP-dependent enzyme. Before joining broken DNA ends, it uses ATP to activate the 5′-phosphate end, allowing formation of a phosphodiester bond. NAD⁺ is a cofactor for some bacterial DNA ligases, but not for T4 DNA ligase. Exam tip: Remember T4 DNA ligase as ATP-dependent, whereas E. coli DNA ligase is NAD⁺-dependent.

Related tags

T4 Dna LigaseAtpLigationDna Recombinant TechnologyEnzymesLigase EnzymesPrinciples Of BiotechnologyBiotechnology

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