Question

A foreign DNA and plasmid cut by the same restriction endonuclease can be joined to form a recombinant plasmid using (1) Eco RI (2) Taq polymerase (3) Polymerase III (4) Ligase

Answer 1

Answer:  (4) Ligase

Explanation:    DNA ligases

When cut by the same restriction endonuclease,the resulting DNA fragments have the same kind of sticky ends and these can be joined together by using DNA ligases.

DNA ligases join the piece of foreign  DNA with the 'cut' plasmid making it circular plasmid again.Now the circular plasmid contains the original gene as well as the foreign gene.