Question

Identify the mismatched pair with regard to transcription in eukaryotic cells.

• A. RNA Polymerase I \(\rightarrow\) 28S rRNA and 18S rRNA
• B. RNA Polymerase II \(\rightarrow\) SnRNA and hnRNA
• C. RNA Polymerase II \(\rightarrow\) hnRNA
• D. RNA Polymerase III \(\rightarrow\) SnRNA and 5S rRNA

Hint:

Remember: \[ \boxed{ \begin{aligned} &\text{RNA Polymerase I} &&\rightarrow rRNA &\text{RNA Polymerase II} &&\rightarrow hnRNA &\text{RNA Polymerase III} &&\rightarrow tRNA,\ 5S\ rRNA,\ \text{snRNA} \end{aligned} } \]

Answer 1

The Correct Option is B

Step 1: Recall the functions of eukaryotic RNA polymerases. \[ \boxed{ \begin{aligned} \text{RNA Polymerase I} &\rightarrow 28S,\ 18S,\ 5.8S\ rRNA \text{RNA Polymerase II} &\rightarrow hnRNA\ (mRNA\ precursor) \text{RNA Polymerase III} &\rightarrow tRNA,\ 5S\ rRNA,\ \text{some snRNA} \end{aligned} } \]

Step 2: Identify the mismatched pair. snRNA is primarily synthesized by RNA Polymerase III (as per NCERT classification), not by RNA Polymerase II. Hence, \[ \boxed{\text{RNA Polymerase II }\rightarrow\text{ SnRNA and hnRNA}} \] is the mismatched pair.

Step 3: Choose the correct option. Therefore, the correct option is \[ \boxed{(B).} \]