Question

_________ catalyse covalent bonding between two molecules to form a large molecule.

• A. Hydrolases
• B. Transferases
• C. Isomerases
• D. Ligases

Answer 1

The correct option is D Ligases

Ligases catalyze synthesis by condensation of two groups by utilising energy from compounds such as ATP. For example - DNA ligase enzymes join two DNA fragments by catalysing the formation of phosphodiester bonds. Other classes of enzymes have been discussed below.

$\begin{array}{cc}\text{Class}& \text{Function}\\ \text{Oxidoreductase}& \text{This class of enzymes catalyses reactions that involve electron transfer}\\ \text{Transferase}& \text{Enzymes that catalyse reactions which involve the transfer of groups of atoms are a member of this class}\\ \text{Hydrolase}& \text{Enzymes that catalyse the hydrolysis reaction are a member of this class}\\ \text{Lyase}& \text{Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds}\\ \text{Isomerase}& \text{This class of enzymes are involved in reactions that convert a substance into its isomer}\end{array}$