RNA acted upon by enzyme

Options

A. ribozyme
B. ribonuclease
C. peptidal transferase
D. All of these

Answer

To solve the question "RNA acted upon by enzyme," we need to analyze the options provided and determine which enzymes can act on RNA. Let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: We need to identify which enzymes can act upon RNA. The options provided are ribozyme, ribonuclease, peptidyl transferase, or all of these.

2. **Analyzing Ribozyme**:
- Ribozyme is a type of RNA molecule that has catalytic properties.
- It can catalyze specific biochemical reactions such as RNA splicing, viral replication, and tRNA biosynthesis.
- Ribozyme functions as part of the large subunit of ribosomal RNA (rRNA) during protein synthesis, linking amino acids together.
- **Conclusion**: Ribozyme acts upon RNA.

3. **Analyzing Ribonuclease**:
- Ribonuclease is an enzyme that catalyzes the degradation of RNA into smaller components.
- It breaks down RNA molecules, which is a direct action upon RNA.
- **Conclusion**: Ribonuclease acts upon RNA.

4. **Analyzing Peptidyl Transferase**:
- Peptidyl transferase is an enzyme that forms peptide bonds between adjacent amino acids during protein synthesis.
- It utilizes tRNA (transfer RNA) in the translation process, which involves RNA.
- **Conclusion**: Peptidyl transferase acts upon RNA indirectly by using tRNA.

5. **Final Conclusion**:
- Since all three enzymes (ribozyme, ribonuclease, and peptidyl transferase) can act upon RNA in different ways, the correct answer is "all of these."

### Final Answer:
All of these (ribozyme, ribonuclease, and peptidyl transferase) act upon RNA.

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