What Are Enzymes and What Do They Do

What are enzymes and what do they do?

A) Enzymes are carbohydrates, which lower the energy required for chemical reactions required to maintain living things.
B) Enzymes are nucleic acids, which lower the energy required for chemical reactions required to maintain living things.
C) Enzymes are proteins, which lower the energy required for chemical reactions required to maintain living things
D) Enzymes are proteins, which provide a pathway for materials to get into and out of cells.
E) Enzymes are carbohydrates, which provide a pathway for materials to get into and out of cells.