Not all enzymes work inside cells in the body

Enzymes can be divided into two groups, intracellular and extracellular enzymes.

Enzymes formed and retained in the cell are known as intracellular enzymes. They are found in the cytoplasm, organelles  and the nucleus of the cell. Examples of such enzymes are DNA polymerase, RNA polymerase and ATP synthetase.

Extracellular enzymes are produced in the cell then packed and secreted from the cell.  This kind of enzymes catalyze reactions outside the cell. Most digestive enzymes are extracellular enzymes . Examples of such are amylase, zymase and cellulase

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.