LIFE SCIENCE

Detailed explanation-1: -Answer and Explanation: Our cells cannot use starch as it is. Before starch can enter a cell, it must be broken down into its individual glucose molecules. The glucose molecules can then be transported inside the cell and used to power cellular respiration reactions.

Detailed explanation-2: -Starch digestion involves the breakdown by -amylase to small linear and branched malto-oligosaccharides, which are in turn hydrolyzed to glucose by the mucosal -glucosidases, maltase-glucoamylase (MGAM) and sucrase-isomaltase (SI).

Detailed explanation-3: -During digestion, starches and sugars are broken down both mechanically (e.g. through chewing) and chemically (e.g. by enzymes) into the single units glucose, fructose, and/or galactose, which are absorbed into the blood stream and transported for use as energy throughout the body.

Detailed explanation-4: -What happens in the body when we eat sugar? Once in the body, carbohydrates are broken down into their basic units by digestive enzymes in the gastrointestinal tract. Granulated sugar, for example, is broken down into glucose and fructose, and lactose from dairy is broken down into glucose and galactose.