Medically reviewed by Qin Rao, MD Elevated liver enzymes can occur for many reasons. Most often, elevated liver enzymes are ...

Liver enzymes are measured in international units per liter (U/L). The normal range of values (meaning the values between which levels are normal) are: ALT: Between 4 and 36 U/L AST: Between 8 and ...

The active site has a specific shape that is complementary to the shape of its substrate, allowing them to fit together like a lock and key, meaning each enzyme works with only one specific substrate.

Enzymes catalyze nearly all of the chemical reactions that occur in biological systems. Enzymes are generally proteins but also include catalytic DNA and catalytic RNA. As effective biological ...