Enzymes joining two molecules by establishing covalent bonds are

Ligases

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Transferases

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Oxidoreductases

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Lyases

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Solution

The correct option is C Ligases
Ligase is an enzyme which is used to join two molecules by establishing covalent bonds. Two DNA molecules are joined together by phosphodiester bond in presence of DNA ligase. The enzyme cannot be used for the blunt end of the DNA fragments. The nature of the bond is covalent as it involves the exchange of electrons.
So, the correct answer is option A.

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