Question

Enzymes which catalyse reactions involving changes in structure of a molecule are

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

Answer 1

The correct option is B Isomerases

Enzyme catalyzing optical or geometrical rearrangement of atomic groupings without altering molecular weight or number of atom is isomerase. It converts into from one isomer to the other isomer by changing the intramolecular arrangement by forming or breaking the bond. For, example glucose 6 phosphate is changed to fructose 6 phosphate by enzyme isomerase during the process of glycolysis.

Ligase is a 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.

Hydrolase are the enzyme which catalyses the splitting of compounds by addition of water.

Transferases helps to transfer functional group from one molecule to another.

So, the correct answer is option B.