Question

Glycogen is related to
A. Glucose
B. Starch
C. Ribose sugar
D. Lactose

Answer 1

Hint: Glycogen is a large, branched polysaccharide present in animals and humans as the main storage. Glycogen acts as an essential reservoir of energy.

Complete Answer:
Glycogen is generated and processed in the liver and muscle cells that are hydrated by the four components of water. It functions as a long-term secondary storage of energy.

Now, let us find the solution from the options-
- Glycogen is a glucose polymer. It's an amylopectin-like structure where two alpha 1,4 glucose unit polymer chain glucose are connected by alpha 1,6 binding. The glucose found in the blood serves as an instantaneous supply of muscle energy. Glucose is in the form of glycogen contained in the liver. By glycogenolysis in the muscles, the glycogen is converted into glucose and the glucose produces energy by glycolysis to the muscle in the form of ATP.

- A polymeric carbohydrate composed of various glucose units connected by glycosidic bonds is starch. Starch is used in plants as a nutrient supply, and glycogen is often used as a retained muscle supply. Thus, the option B is incorrect.

- Ribose, also known as D-ribose, is a five-carbon sugar present in ribonucleic acid (RNA) where it switches to form the "backbone" of the RNA polymer with phosphate groups and bonds to nitrogen bases. Thus, the option C is incorrect.

- Lactose is a carbohydrate containing one glucose molecule and one galactose molecule bonded together. Lactose, which makes up about 2 to 8% of the milk of all mammals, is often referred to as milk sugar. Thus, the option D is incorrect.

Thus, the correct answer is option A, Glucose.

Note: Glycogen is made up of long glucose unit polymer chains that are bound by an alpha acetal linkage. The association of the carbonyl group and the alcohol group forms this acetal linkage. If the carbonyl group is an aldehyde group and there is a ketonic group, it is often called hemiacetal. It refers to the acetal group if two alkoxy groups are attached to the same carbon atom.