Which of the following compound is considered as a heteropolysaccharide?

Options

A. Glycogen
B. Chitin
C. Starch
D. Hyaluronic acid

Answer

To determine which of the following compounds is considered a heteropolysaccharide, we need to understand the definitions and characteristics of heteropolysaccharides and compare the given options: chitin, starch, and hyaluronic acid.

### Step 1: Define Heteropolysaccharides
A heteropolysaccharide is a type of polysaccharide that is composed of two or more different types of monosaccharide units (monomers). This contrasts with homopolysaccharides, which are made up of only one type of monosaccharide.

### Step 2: Analyze the Given Compounds
1. **Chitin**:
- Chitin is a polysaccharide made up of N-acetylglucosamine units. It is a homopolysaccharide because it consists of only one type of monomer.

2. **Starch**:
- Starch is composed of glucose units and is also a homopolysaccharide. It consists solely of one type of monosaccharide (glucose).

3. **Hyaluronic Acid**:
- Hyaluronic acid is a heteropolysaccharide composed of two different types of sugar molecules: N-acetylglucosamine and glucuronic acid. This makes it a heteropolysaccharide.

### Step 3: Conclusion
Based on the analysis:
- Chitin is a homopolysaccharide.
- Starch is a homopolysaccharide.
- Hyaluronic acid is a heteropolysaccharide.

Thus, the correct answer is **hyaluronic acid**.

### Final Answer
**Hyaluronic acid** is considered a heteropolysaccharide.

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