What is the name of the group of proteins that can speed up the process or reduce the activation energy of a reaction?

Enzymes and activation energy

Explanation:

A substance that speeds up a chemical reaction—without being a reactant—is called a catalyst. The catalysts for biochemical reactions that happen in living organisms are called enzymes. Enzymes are usually proteins, though some ribonucleic acid (RNA) molecules act as enzymes too. hope this helps you :)

nucleus

would be most reasonable answer tbh