Which of incorrect regarding glycogen

Options

A. Glycohen is analgous to starch
B. It is non reducing sugar
C. It is a structual polysaccharide
D. It given red colour with iodine solution

Answer

To determine which statement regarding glycogen is incorrect, let's analyze each option provided in the question.

1. **Glycogen is analogous to starch.**
- Glycogen is indeed analogous to starch. Both serve as reserve food materials, but glycogen is primarily found in animals while starch is found in plants. Therefore, this statement is **correct**.

2. **Glycogen is a non-reducing sugar.**
- Glycogen is classified as a non-reducing sugar because it does not have a free aldehyde or ketone group that can reduce other compounds. Thus, this statement is also **correct**.

3. **Glycogen is a structural polysaccharide.**
- This statement is **incorrect**. Glycogen is not a structural polysaccharide; it is a storage polysaccharide. Structural polysaccharides include cellulose, which provides structural support in plant cell walls. Glycogen is a branched polysaccharide used for energy storage in animals.

4. **Glycogen gives red color with iodine solution.**
- When glycogen reacts with iodine, it typically gives a reddish-brown color, indicating the presence of polysaccharides. Hence, this statement is **correct**.

Based on the analysis, the incorrect statement regarding glycogen is:

**Glycogen is a structural polysaccharide.**