These molecules have the ability to direct their duplications

Options

A. DNA and RNA
B. DNA and Proteins
C. RNA and proteins
D. DNA, RNA and proteins

Answer

To solve the question "These molecules have the ability to direct their duplications," we need to analyze the options provided and understand the roles of DNA and RNA in the process of duplication.

### Step-by-Step Solution:

1. **Identify the Molecules**: The question mentions "molecules" that can direct their duplications. The options provided are:
- DNA and RNA
- DNA and proteins
- RNA and proteins
- DNA, RNA, and proteins

2. **Understand the Role of DNA**:
- DNA (Deoxyribonucleic Acid) is the primary genetic material in most organisms. It has the ability to replicate itself through a process known as DNA replication. This means that DNA can direct its own duplication.

3. **Understand the Role of RNA**:
- RNA (Ribonucleic Acid) also plays a crucial role in the genetic processes of some organisms. In certain viruses, RNA serves as the genetic material and can replicate itself. RNA can also be synthesized from DNA through transcription and can replicate through processes involving RNA polymerase.

4. **Analyze the Role of Proteins**:
- Proteins, while essential for various cellular functions, do not have the ability to replicate themselves. They are synthesized based on the information encoded in DNA and RNA but do not possess the capability to direct their own duplication.

5. **Conclusion**:
- Based on the analysis, the molecules that have the ability to direct their duplications are DNA and RNA. Therefore, the correct answer is "DNA and RNA."

### Final Answer:
**DNA and RNA** are the molecules that have the ability to direct their duplications.

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