Name the class of enzyme that usually catalyze the following reaction:
S – G + S^# → S + S^# – G
Where, G – a group other than hydrogen
             S – a substrate
             S^# – another substrate

The correct answer is Transferase

Explanation:

Enzymes are divided into 6 classes each with 4-13 subclasses and named accordingly by a four-digit number.

• Transferases: Enzymes catalysing a transfer of a group, G (other than hydrogen) between a pair of substrate S and S’

S - G + S' → S + S' - G

• Hydrolases: Enzymes catalysing hydrolysis of ester, ether, peptide, glycosidic, C-C, C-halide or P-N bonds.
• Oxidoreductases/dehydrogenases: Enzymes which catalyse oxidoreduction between two substrates S and S’.
• Lyases: Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds.
• Isomerases: Includes all enzymes catalysing inter-conversion of optical, geometric or positional isomers.
• Ligases: Enzymes catalysing the linking together of 2 compounds, e.g., enzymes which catalyse joining of C-O, C-S, C-N, P-O etc. bonds