Which type of reaction do enzymes facilitate?

Enzymes are biological catalysts that speed up the rates of chemical reactions in both directions, meaning they can facilitate both forward and reverse reactions. This ability arises from their role in lowering the activation energy required for a reaction to proceed. In the context of metabolic pathways, enzymes are crucial because they can help convert substrates into products and also convert products back into substrates when necessary. This dual functionality allows for greater regulation and flexibility in biological systems, enabling them to adjust to changing conditions and maintain homeostasis.

The mention of nuclear reactions pertains to a completely different field of chemistry and is not relevant to enzymes, which operate within biochemical reactions, not nuclear ones. Additionally, saying that enzymes facilitate only forward or only reverse reactions would be inaccurate, since their actions are not limited to just one direction.