Types of reactions occurring in living organisms.

Catabolic reactions. Exothermic reactions in organisms are called catabolic reactions. These reactions break molecules down into smaller units and release energy. An example of a catabolic response is the breakdown of glucose during cellular respiration, which releases energy that cells must use to carry out life processes.

Anabolic reactions. Endothermic reactions in organisms are called anabolic reactions. These reactions create larger molecules from smaller ones and absorb energy. An example of an anabolic reaction is the combination of amino acids to form protein.