What is unique to DNA alone

Options

A. Denaturation and renaturation
B. Polymer complex
C. Replication
D. Resistance to temperature changes.

Answer

To answer the question "What is unique to DNA alone?", we need to identify a characteristic or feature that is exclusive to DNA and not shared with RNA or proteins.

### Step-by-Step Solution:

1. **Understanding DNA Structure**:
- DNA (Deoxyribonucleic Acid) is a double-stranded molecule composed of nucleotides, which include a phosphate group, a sugar (deoxyribose), and nitrogenous bases (adenine, thymine, cytosine, and guanine).

**Hint**: Remember that DNA has a specific sugar component that distinguishes it from RNA.

2. **Identifying Unique Features**:
- One of the most significant features of DNA is its ability to undergo replication. This process allows DNA to make copies of itself, which is essential for cell division and the transmission of genetic information to offspring.

**Hint**: Think about processes that involve copying genetic material.

3. **Distinguishing from RNA and Proteins**:
- While RNA also plays a role in the synthesis of proteins and can undergo processes like transcription, it does not replicate itself in the same way DNA does. Proteins do not replicate; they are synthesized based on the information provided by DNA and RNA.

**Hint**: Consider what happens during cell division and how genetic information is passed on.

4. **Conclusion**:
- The unique feature that is exclusive to DNA is its ability to replicate. This process ensures that genetic information is accurately copied and passed on to daughter cells during cell division.

**Final Answer**: The unique feature of DNA alone is **replication**.