The enzymes in living organisms are very large molecules that are essentially responsible for sustaining human life. Enzymes perform thousands of metabolic processes that keep a living organism alive, but there is no guaranteed explanation for how it works. What makes enzymes even more interesting is the fact that they are highly selective. An enzyme isn’t activated by just any substrate. In fact, enzymes only catalyze certain reactions and it chooses specific substrates involved in the reactions.
Enzymes are complicated molecules, but they only make up one component of the various things that go on in living organisms on a molecular level. If you’re interested in learning more about molecular organisms and how they help sustain life, then you should check out the Udemy course, An Introduction to Basic Biology.