Some enzymes can transfer a hydrogen atom without lowering the activation energy barrier. How is this possible? Some enzymes can transfer a hydrogen atom without lowering the activation energy barrier. How is this possible?

(A) This is possible by means of a mechanism known as allosteric regulation.
(B) This is possible by means of a mechanism known as electron transfer.
(C) This is possible by means of a mechanism known as quantum tunneling.

Some of the enzymes can transfer an atom of hydrogen without lowering the activation energy barrier with the help of a mechanism called quantum tunneling.

In case if the reaction comprises a huge amount of activation energy, in such instances, some of the enzymes can mediate the atom of hydrogen without lowering the barrier of activation energy. In the process of quantum tunneling the organization of the substrates takes place close to the amino acids and permits the transfer of protons.