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Some common liver function tests include: 1  Alanine transaminase (ALT). ALT is an enzyme found in the liver that helps your body metabolize protein. 2  Aspartate transaminase (AST). AST is an enzyme that helps metabolize alanine, an amino acid. 3  Alkaline phosphatase (ALP). ALP is an enzyme in the liver, bile ducts and bone.  Albumin and total protein.
Mechanisms of Enzyme action. Enzymes are essential proteins that are found in all living cells. They have two main functions: 1) they act as catalysts ( a catalyst is a chemical which speeds up a chemical reaction ) 2) they control all the chemical reactions going on inside the cell. Every cell has many different enzymes. Each enzyme is specific : it only affects one particular chemical.