Final answer:
Chemical digestion is the major reaction involved in the digestion of macromolecules. It breaks down macromolecules in food into smaller molecules that can be absorbed and used by cells. Specific enzymes are responsible for breaking down each macromolecule, such as amylase for carbohydrates, proteases for proteins, and lipases for lipids.
Step-by-step explanation:
Chemical digestion is the major reaction involved in the digestion of macromolecules. It is the process in which macromolecules in food are broken down into smaller molecules that can be absorbed and transported to cells throughout the body. Carbohydrates are broken down into simple sugars, proteins into amino acids, lipids into fatty acids and glycerol, and nucleic acids into individual nucleotides. Each macromolecule is broken down by specific enzymes, such as amylase for carbohydrates, proteases for proteins, and lipases for lipids, and these broken down macromolecules provide energy for cellular activities.