Question

An enzyme that aids in the addition of a group to a double bond is a) a transferase b) an oxidoreductase c) a ligase d) an isomerase e) a lyase

Answer 1

The right answer is option E, a lyase

Explanation

Lyase enzymes are involved in catalysis of addition of two groups to remove a double bond or removal of two groups to create a double bond in a molecule. Hence it is the correct answer.

The other options are incorrect because,

Option a, transferases are involved in transfer of functional groups from one molecule to another.

Option b, oxidoreductase enzymes catalyse oxidation and reduction reaction by either oxidising or reducing the substrate in the presence of a coenzyme.

Option c, ligases catalyse the joining of two molecules to form a single molecule.

Option d, isomerases catalyse the isomeration reactions. The products formed are isomers of the reactants.

So as we see the other options are not involved in addition of groups to form a double bond. Hence only option E, lyases is the correct answer.