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Which fact is most important in explaining how enzymes speed reactions? Very low potential energy tends to make molecules unstable. High-energy collisions are less common than low-energy collisions. It takes less energy to break a hydrogen bond than a covalent bond. Large molecules collide more energetically than small molecules. Every reaction step adds to the time required for the overall reaction. Study Enzyme Activity.
Enzymes are organic catalysts. A catalyst is a chemical that  controls the rate of a reaction, but is itself not used up in the  process. Reactions that are accelerated due â¦ to the presence of  enzymes are known as enzyme-catalyzed reactions.Answered.nzymes are cataysts because they also speeds up reaction.Enzymes also breaks down particles substances.Example of an enzyme that breaks down is,the enzymes amalzye.