In eukaryotic rRNA and tRNA synthesis is catalysed by :

Options

A. RNA polymerase I and DNA polymerase I
B. RNA polymerase II and DNA polymerase II
C. DNA polymerase I and II
D. RNA polymerase I and II

Answer

To solve the question regarding which enzymes catalyze the synthesis of rRNA and tRNA in eukaryotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of RNA**: In eukaryotic cells, there are several types of RNA, including ribosomal RNA (rRNA) and transfer RNA (tRNA). Each type of RNA has a specific function in the cell.

2. **Identify the Role of RNA Polymerases**: In eukaryotes, RNA synthesis is carried out by different types of RNA polymerases. Specifically:
- **RNA Polymerase I** is responsible for synthesizing rRNA.
- **RNA Polymerase II** is responsible for synthesizing mRNA and also tRNA.

3. **Determine the Correct Answer**: Since the question asks about the synthesis of both rRNA and tRNA, we need to identify which RNA polymerases are involved:
- rRNA is synthesized by RNA Polymerase I.
- tRNA is synthesized by RNA Polymerase II.

4. **Select the Correct Option**: The correct answer to the question is the option that includes both RNA Polymerase I and RNA Polymerase II, as they are responsible for the synthesis of rRNA and tRNA, respectively.

### Final Answer:
The synthesis of rRNA and tRNA in eukaryotes is catalyzed by **RNA Polymerase I and RNA Polymerase II**.

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