Question

Study the items of Column-I and those of Column-II:

Choose the option that correctly matches the items of Column-I with those of Column-II:

• (a) (i), (b) (iii), (c) (ii)
• (a) (ii), (b) (iii), (c) (i)
• (a) (iii), (b) (ii), (c) (i)
• (a) (ii), (b) (i), (c) (iii)

Hint:

RNA polymerase I synthesizes rRNA (including 18S rRNA), RNA polymerase II synthesizes mRNA and snRNAs, and RNA polymerase III synthesizes tRNA and other small RNAs.

Answer 1

The Correct Option is A

Matching RNA Polymerases with Their Products 

The question asks to match the types of RNA polymerases with the RNA products they synthesize. Here's the detailed explanation:

Step 1: Understanding RNA Polymerases and Their Products

• RNA Polymerase I: This enzyme is responsible for synthesizing 18s rRNA (a part of the ribosomal RNA essential for ribosome function).
• RNA Polymerase II: This enzyme synthesizes hnRNA (heterogeneous nuclear RNA), which is the precursor to mRNA in eukaryotic cells.
• RNA Polymerase III: This enzyme synthesizes SnRNAs (small nuclear RNAs), which are involved in the splicing of mRNA.

Step 2: Matching the RNA Polymerases with Their Products

Now, let's match each RNA polymerase with its corresponding RNA product:

• (a) RNA polymerase I: This enzyme synthesizes 18s rRNA, so the correct match is (i) 18s rRNA.
• (b) RNA polymerase II: This enzyme synthesizes hnRNA, so the correct match is (iii) hnRNA.
• (c) RNA polymerase III: This enzyme synthesizes SnRNAs, so the correct match is (ii) SnRNAs.

Step 3: Conclusion

Thus, the correct matching is:

Option (A): (a) (i), (b) (iii), (c) (ii)

This means:

• (a) RNA polymerase I matches with 18s rRNA (i)
• (b) RNA polymerase II matches with hnRNA (iii)
• (c) RNA polymerase III matches with SnRNAs (ii)