It's not a single protein or hormone that influences *all* chemical processes in living organisms. Instead, it's a complex interplay of many proteins and hormones that work together to regulate the intricate web of biochemical reactions. However, some key players include:

Proteins:

* Enzymes: These are the workhorses of metabolism. They catalyze (speed up) nearly every chemical reaction in the body. Each enzyme has a specific function, breaking down molecules, building new ones, or transferring chemical groups. Without enzymes, reactions would occur too slowly to sustain life.

* Structural proteins: These provide support and structure to cells and tissues. Examples include collagen and keratin.

* Transport proteins: These bind and carry molecules throughout the body, such as oxygen in red blood cells.

Hormones:

* Insulin: This hormone regulates blood sugar levels by promoting glucose uptake by cells.

* Growth hormone: This hormone stimulates growth and development.

* Thyroid hormone: This hormone regulates metabolism, affecting energy production and use.

* Cortisol: This hormone helps the body cope with stress by regulating blood sugar and inflammation.

Overall:

It's important to note that this is just a small sampling of the many proteins and hormones involved in regulating chemical processes. The precise interplay between these molecules is complex and constantly adapting to the body's needs.