AP BIOLOGY

Detailed explanation-1: -Large food molecules (for example, proteins, lipids, nucleic acids, and starches) must be broken down into subunits that are small enough to be absorbed by the lining of the alimentary canal. This is accomplished by enzymes through hydrolysis. The many enzymes involved in chemical digestion are summarized in Table 1.

Detailed explanation-2: -Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.

Detailed explanation-3: -Amylase is a digestive enzyme that acts on starch in food, breaking it down into smaller carbohydrate molecules. Once food along with salivary amylase enters the stomach, action of hydrolytic enzymes lead to amylase deactivation.

Detailed explanation-4: -Digestion of food is a form of catabolism, in which the food is broken down into small molecules that the body can absorb and use for energy, growth, and repair. Digestion occurs when food is moved through the digestive system. It begins in the mouth and ends in the small intestine.