Enzymes catalysing the linking together of two compounds, for example, enzymes which catalyse joining of C-O, C-S, C-N, P-O etc., bonds are classified as :

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Ligases are the class of enzymes that catalyse the linking together of two compounds, e.g., enzymes which catalyse joining of C-O, C-S, C-N, P-O etc. bonds. Lyases catalyse the removal of groups by mechanisms other than hydrolysis leaving double bonds. Transferases catalyse a transfer of a group (other than hydrogen) between a pair of substrates. Hydrolases catalyse the hydrolysis of ester, ether, peptide, glycosidic, C-C, C-halide or P-N bonds. Answer: Ligases