Final answer:
The substrate for amylase is starch, as amylase breaks it down into smaller molecules like dextrins, maltose, and glucose during digestion. Cellulose and peptides are not substrates for amylase.
Step-by-step explanation:
The substrate for amylase is starch. Amylase is an enzyme responsible for breaking down starch into smaller carbohydrate molecules such as dextrins, maltose, and eventually glucose. In the human body, specifically, amylase initiates the chemical digestion of starch by breaking it down into maltose and dextrins in the mouth, and then continues the process in the small intestine to produce glucose which can be absorbed and used by the cells for energy.
The other substances listed, such as cellulose and peptides, are not the substrates for amylase. Cellulose is a polysaccharide made up of glucose monomers bonded in a way that cannot be broken down by human digestive enzymes. Peptides, on the other hand, are short chains of amino acids and are the substrates for other enzymes like proteases, not amylase.