In a eukaryotic cell during transcription enzymes RNA polymerase l, ll and lll are used respectively for the formation of:

Options

A. m- RNA , t - RNA and 5S r- RNA
B. t-RNA, 28S r- RNA and m-RNA
C. 5.8S r-RNA, hn- RHA and and t- RNA
D. 18Sr- RNA , t-RNA and m- RNA

Answer

To solve the question regarding the roles of RNA polymerases I, II, and III in eukaryotic cells during transcription, we need to identify which types of RNA each polymerase synthesizes. Here’s a step-by-step breakdown:

### Step 1: Identify the function of RNA Polymerase I
RNA Polymerase I is primarily responsible for synthesizing ribosomal RNA (rRNA), specifically the large rRNA components, which include 28S, 18S, and 5.8S rRNA.

**Hint:** Remember that RNA Polymerase I is mainly involved in the production of rRNA, which is a key component of ribosomes.

### Step 2: Identify the function of RNA Polymerase II
RNA Polymerase II is responsible for synthesizing messenger RNA (mRNA). The precursor to mRNA is known as heterogeneous nuclear RNA (hnRNA), which is processed to form mature mRNA.

**Hint:** RNA Polymerase II is crucial for mRNA synthesis, so think about the role of mRNA in protein synthesis.

### Step 3: Identify the function of RNA Polymerase III
RNA Polymerase III synthesizes transfer RNA (tRNA) and 5S rRNA, as well as small nuclear RNAs (snRNAs).

**Hint:** Consider that RNA Polymerase III is involved in producing smaller RNA molecules that play roles in translation and RNA processing.

### Step 4: Compile the information
Based on the functions identified:
- RNA Polymerase I → rRNA (28S, 18S, 5.8S)
- RNA Polymerase II → mRNA (hnRNA precursor)
- RNA Polymerase III → tRNA and 5S rRNA

### Conclusion
The correct answer to the question is:
- RNA Polymerase I → rRNA
- RNA Polymerase II → mRNA
- RNA Polymerase III → tRNA

Thus, the correct option is that RNA polymerases I, II, and III are used respectively for the formation of rRNA, mRNA, and tRNA.

**Final Answer:** RNA Polymerase I → rRNA, RNA Polymerase II → mRNA, RNA Polymerase III → tRNA.