Which one is heteropolymer?

Options

A. Chitin
B. Peptidoglycan
C. Both
D. Inulin

Answer

To determine which of the given options is a heteropolymer, we can analyze each option based on its composition:

1. **Chitin**:
- Chitin is a polymer made up of repeating units of N-acetylglucosamine.
- Since it consists of only one type of monomer (N-acetylglucosamine), it is classified as a **homopolymer**.

2. **Peptidoglycan**:
- Peptidoglycan is composed of two different types of monomers: N-acetylglucosamine and N-acetylmuramic acid.
- Because it contains more than one type of monomer, it is classified as a **heteropolymer**.

3. **Both**:
- This option suggests that both chitin and peptidoglycan are heteropolymers, which is incorrect since chitin is a homopolymer.

4. **Inulin**:
- Inulin is a homopolymer made up of fructose units.
- Like chitin, it consists of only one type of monomer, making it a **homopolymer**.

Based on the analysis above, the correct answer is **Peptidoglycan**, as it is the only heteropolymer among the options provided.

### Final Answer:
**Peptidoglycan is the heteropolymer.**