Question

animals also make polysaccharides. excess sugar in animals is stored as glycogen, which is sometimes called animal starch. each large glycogen molecule is formed by many glucose monomers linked together. these long chains of glucose form many branches.
glycogen plays an important role in regulating blood sugar. when glucose levels in blood are low, glycogen is broken down by the body to provide glucose. in the muscles, glycogen is also broken down to release energy to help with muscle contraction.
what are the functions of glycogen? select all that apply.
animals store excess sugar as glycogen.
glycogen can be broken down to release glucose and increase blood sugar.
glycogen provides structural support for cell walls.
energy from glycogen can be used for muscle contraction.

Explanation:

• Option 1: The text explicitly states "Excess sugar in animals is stored as glycogen".
• Option 2: It is mentioned that "When glucose levels in blood are low, glycogen is broken down by the body to provide glucose", which means it can increase blood sugar.
• Option 3: Glycogen is not related to cell - wall structural support. Cellulose (in plants) and chitin (in fungi and some animals) are for cell - wall support.
• Option 4: The text says "In the muscles, glycogen is also broken down to release energy to help with muscle contraction".

Answer:

• Animals store excess sugar as glycogen.
• Glycogen can be broken down to release glucose and increase blood sugar.
• Energy from glycogen can be used for muscle contraction.