Which of the following IS INCORRECT about glycogen ?

Options

A. It is a stored form of glucose in animals
B. In glycogen , right end is reducing and left end is non-reducing
C. It is a branched polymer of glucose
D. It is a good reducing agent

Answer

To determine which statement about glycogen is incorrect, let's analyze each option provided:

1. **Glycogen is a stored form of glucose in animals.**
- This statement is correct. Glycogen serves as a primary storage form of glucose in animal cells, particularly in the liver and muscles.

2. **In glycogen, the right end is reducing and the left side is non-reducing.**
- This statement is also correct. Glycogen is a polysaccharide, and its structure includes a reducing end (where the anomeric carbon is free) and a non-reducing end (where glucose units are linked).

3. **It is a branched polymer of glucose.**
- This statement is correct as well. Glycogen is indeed a branched polymer, consisting of glucose units linked together with α-1,4-glycosidic bonds and branching points formed by α-1,6-glycosidic bonds.

4. **It is a good reducing agent.**
- This statement is incorrect. Glycogen is not considered a good reducing agent. While it contains reducing ends, it does not exhibit strong reducing properties like some other carbohydrates (e.g., glucose).

Based on this analysis, the incorrect statement about glycogen is:

**Answer: It is a good reducing agent.**