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What is a safe one-line answer for ligase enzymes?

Answer and explanation

Correct answer: They join DNA ends with the help of energy

The direct answer is option A: ligase enzymes join DNA ends with the help of energy. During ligation, DNA ends are brought close together and the enzyme catalyses formation of phosphodiester bonds in the sugar-phosphate backbone. Energy is needed for this bond-forming reaction. This function is useful in DNA repair, replication, and cloning, where separate DNA pieces must become one continuous molecule. Option A is correct because it gives the essential action of DNA ligase. Option B is wrong because cutting DNA at recognition sites is done by restriction enzymes, not ligase. Option C is wrong because protein digestion into amino acids is performed by proteolytic enzymes. Option D is wrong because glucose does not become chlorophyll through ligase activity; chlorophyll synthesis is a different biochemical pathway. Memory cue: ligase is the molecular glue of DNA.

Related tags

One Line AnswerLigase EnzymesDna Ends

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