Final Answer:
The statement that is true about glycogen is b) It is a storage form of glucose in animals.
Step-by-step explanation:
Glycogen serves as the primary storage form of glucose in animals, particularly in the liver and muscles. This polysaccharide is not a simple sugar but a complex carbohydrate composed of multiple glucose units linked together through glycosidic bonds. The function of glycogen is to store glucose for energy needs, especially during times when blood glucose levels drop, such as between meals or during physical activity.
The synthesis and breakdown of glycogen are tightly regulated processes. When glucose levels are high, excess glucose is converted into glycogen through glycogenesis. Conversely, when glucose is needed, glycogen is broken down into glucose through glycogenolysis. This dynamic regulation helps to maintain blood glucose levels within a narrow range, ensuring a constant energy supply for the body.
Unlike options a, c, and d, which incorrectly describe glycogen as a simple sugar, produced in the pancreas, or an enzyme in digestion, respectively, the correct statement is that glycogen serves as a b) storage form of glucose in animals.