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(A) $1$. Ligases are enzymes that catalyze the joining of two $DNA$ molecules by forming phosphodiester bonds. This is a correct statement.$2$. Polyme

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Ligases $-$ Join two $DNA$ molecules

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(A) $1$. Ligases are enzymes that catalyze the joining of two $DNA$ molecules by forming phosphodiester bonds. This is a correct statement.$2$. Polymerases are enzymes that synthesize $DNA$ strands,not cut them.$3$. Nucleases are enzymes that degrade $DNA$ by breaking phosphodiester bonds. Helicases are responsible for separating the $DNA$ double helix.$4$. Exo-nucleases remove nucleotides from the ends of $DNA$ molecules,whereas Endo-nucleases cut $DNA$ at specific internal positions.

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