Exoskeleton of arthropods have a complex polysaccharide called chitin, which consists of only one type of amino sugar that is :-

Options

A. N–acetyl–galactosamine
B. N–acetyl–glucosamine
C. `beta` –fructose
D. `beta` –glucose

Answer

**Step-by-Step Solution:**

1. **Understanding the Composition of Exoskeletons in Arthropods:**
- The exoskeleton of arthropods is primarily made up of a complex polysaccharide known as chitin.

2. **Identifying the Type of Sugar in Chitin:**
- Chitin is a polymer that consists of repeating units of a specific type of amino sugar.

3. **Recognizing the Amino Sugar:**
- The amino sugar that makes up chitin is called N-acetylglucosamine.

4. **Eliminating Incorrect Options:**
- The options provided include:
- Acetylgalactosamine (incorrect)
- Acetylglucosamine (correct)
- Beta fructose (incorrect, as it is related to inulin)
- Beta glucose (incorrect, as it is related to cellulose)
- The only correct option that corresponds to the amino sugar in chitin is Acetylglucosamine.

5. **Conclusion:**
- Therefore, the answer to the question is that the complex polysaccharide chitin in the exoskeleton of arthropods consists of the amino sugar N-acetylglucosamine.

**Final Answer:**
The amino sugar that chitin consists of is N-acetylglucosamine.

---