Enzymes are mainly composed of globular proteins. An enzyme is formed when 100-1000 amino acids string together in a specific order and forms a unique shape that allows the enzyme to carry out specific chemical reactions.

Enzymes increase the rate of chemical reactions without themselves being consumed or permanently altered by the reaction.

Enzymes increase reaction rates without altering the chemical equilibrium between reactants and products.

Each enzyme can only catalysed one or a few reactions because of its unique and complex shapes. Enzymes unique shape creates a space that allows smaller molecules to fit into them, which is called the active site. The shape of the active site matches the shape of its substrate molecules.

A continuous change in the conformation and shape of an enzyme in response to substrate binding. This makes the enzyme catalytic which results in the lowering of the activation energy barrier causing an increase in the overall rate of the reaction.

Enzyme inhibitors are molecules that interact with enzymes, whether temporarily or permanently, in some way and reduce the rate of an enzyme-catalyzed reaction or prevent enzymes to work in a normal manner.