Small nuclear RNAs are involved in

Options

A. Splicing of RNAs
B. Splicing and processing of mRNA
C. Splicing and processing of both rRNA and mRNA
D. Binding of DNA.

Answer

**Step-by-Step Solution:**

1. **Understanding Small Nuclear RNAs (snRNAs):**
- Small nuclear RNAs (snRNAs) are a class of RNA molecules that are found within the nucleus of eukaryotic cells. They play a crucial role in the processing of pre-mRNA.

2. **Role of snRNAs:**
- snRNAs are primarily involved in the splicing of pre-mRNA. They form part of the spliceosome, a complex that removes introns from pre-mRNA and joins exons together to form mature mRNA.

3. **Processing of rRNA:**
- In addition to mRNA splicing, some small nuclear RNAs (specifically small nucleolar RNAs or snoRNAs) are involved in the processing and modification of ribosomal RNA (rRNA). This includes cleavage and chemical modifications necessary for the maturation of rRNA.

4. **Evaluating the Options:**
- Option A: "Splicing of RNA" - This is too vague and does not specify mRNA or rRNA, making it incorrect.
- Option B: "Splicing and processing of mRNA" - While snRNAs are involved in mRNA splicing, this option does not encompass their role in rRNA processing, so it is incomplete.
- Option C: "Splicing and processing of both rRNA and mRNA" - This option accurately describes the functions of snRNAs and snoRNAs, making it the correct answer.
- Option D: "Binding of DNA" - This is incorrect as snRNAs do not play a role in DNA binding.

5. **Conclusion:**
- The correct answer is Option C: "splicing and processing of both rRNA and mRNA."

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