Question

1. explain why starch and glycogen are used for energy storage, while cellulose is used as a structural component? 8. if sucrose (c12h22o11) is made of a glucose (c6h12o6) and a fructose (c6h12o6), why do the number of hydrogen atoms and oxygen atoms in sucrose not add up to that of glucose and fructose?

Explanation:

7.

Starch and glycogen have branched structures. Enzymes can easily break them down to release glucose for energy. Cellulose has a linear - hydrogen - bonded structure that gives it strength for structural support.

When glucose and fructose combine to form sucrose, a dehydration synthesis reaction occurs. A water molecule ($H_2O$) is removed during the formation of the glycosidic bond. So, the number of H and O atoms in sucrose is less than the sum of those in glucose and fructose.

Answer:

Starch and glycogen are used for energy storage because their branched structures allow for easy breakdown by enzymes to release glucose for energy. Cellulose is used as a structural component due to its linear structure with hydrogen - bonding that provides strength and rigidity.

8.