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Why is T4 DNA ligase popular in cloning?

Answer and explanation

Correct answer: It can join both sticky and blunt ends

Direct answer: A, T4 DNA ligase can join both sticky and blunt ends. DNA ligase joins DNA backbones by forming phosphodiester bonds, using energy supplied by the reaction system. T4 DNA ligase, obtained from bacteriophage T4, is widely used because it can efficiently join compatible sticky ends and can also join blunt-ended DNA, although blunt-end ligation is usually less efficient and may need suitable conditions or higher DNA concentration. Option A is correct because it states this broad usefulness. Option B is wrong: cutting DNA is the role of restriction enzymes, not ligase. Option C is wrong because starch digestion is performed by amylase, not T4 DNA ligase. Option D is wrong because ligase does not color proteins. In cloning, this enzyme seals the insert to the vector after their ends have been prepared. Exam cue: ligase joins; T4 ligase handles sticky and blunt ends.

Related tags

T4 Dna LigaseSticky EndsBlunt Ends

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