Final answer:
Biochemical reactions are chemical reactions that take place inside the cells of living things. The sum of all the biochemical reactions in an organism is called metabolism.
Step-by-step explanation:
Biochemical reactions are chemical reactions that take place inside the cells of living things. The sum of all the biochemical reactions in an organism is called metabolism. It includes both catabolic reactions, which are exothermic reactions, and anabolic reactions, which are endothermic reactions.