An example of natural biopolymer is :

Options

A. Teflon
B. Rubber
C. DNA
D. Nylon

Answer

To solve the question "An example of natural biopolymer is:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Biopolymer**:
- A biopolymer is a natural polymer that is produced by living organisms. They are typically made from monomers that are derived from biological sources.

2. **Evaluate the Options**:
- The options given are Teflon, Rubber, DNA, and Nylon. We will analyze each option to determine if it is a natural biopolymer.

3. **Analyze Teflon**:
- Teflon is a synthetic polymer made from the polymerization of tetrafluoroethylene. It is not derived from natural sources, so it is not a biopolymer.

4. **Analyze Rubber**:
- Natural rubber is derived from the latex of rubber trees (Hevea brasiliensis). While it is a natural product, it is not classified as a biopolymer in the same sense as DNA or proteins.

5. **Analyze DNA**:
- DNA (Deoxyribonucleic acid) is the genetic material found in living organisms. It is a natural biopolymer made up of nucleotide monomers. Therefore, DNA is a correct example of a natural biopolymer.

6. **Analyze Nylon**:
- Nylon is a synthetic polymer created through condensation polymerization of specific monomers (like hexamethylene diamine and adipic acid). It is not a natural biopolymer.

7. **Conclusion**:
- Among the options provided, the only example of a natural biopolymer is DNA.

### Final Answer:
The example of a natural biopolymer is **DNA**.

---