How does an enzyme speed up a chemical reaction? Enzymes:

A: Lower the activation energy of chemical reactions.

B: Raise the temperature of the cell, speeding chemical reactions.

C: Store ATP, allowing more energy to be used in chemical reactions.

D: Act as a miniature "transfer trucks" gathering materials for chemical reactions and places them together.

The correct answer here is that lowers the activation energy of chemical reactions - A.

By doing this, it essentially creates an environment where a chemical reaction can happen faster because it doesn't need as much energy to actually take place - for this reason it also happens more often as a lower energy treshold is usually reached faster than a higher one.