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Which enzyme has its source linked with T4 bacteriophage?

Answer and explanation

Correct answer: T4 DNA ligase

The direct answer is option B: T4 DNA ligase. T4 is a bacteriophage, meaning a virus that infects bacteria. The enzyme named T4 DNA ligase is encoded by and associated with bacteriophage T4. It joins DNA ends by catalysing phosphodiester-bond formation and is widely used in molecular cloning, especially for joining DNA fragments. Option B is correct because its name directly identifies the T4 bacteriophage source or association. Option A, E. coli ligase, is associated with the bacterium Escherichia coli, not T4 phage. Option C, DNA polymerase I, is mainly involved in DNA synthesis and replacement of primers or gaps, not identified as the T4-linked ligase in this question. Option D, amylase, digests starch into smaller carbohydrates and is unrelated to DNA joining. Exam cue: the name “T4 DNA ligase” itself points to T4 bacteriophage.

Related tags

T4 BacteriophageT4 Dna LigaseSource

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