Ribonucleic acid occurs in :-

Options

A. Nucleus
B. Cytoplasm
C. Nucleus and cytoplasm
D. Mitochondria and lysosomes

Answer

**Step-by-Step Solution:**

1. **Understanding Ribonucleic Acid (RNA):**
- Ribonucleic acid (RNA) is a molecule essential for various biological roles, including coding, decoding, regulation, and expression of genes.

2. **Transcription Process:**
- RNA is synthesized from DNA through a process called transcription. This process occurs in the nucleus of eukaryotic cells.

3. **Formation of RNA:**
- During transcription, the DNA sequence is copied to produce RNA. This RNA can include various types, such as messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA).

4. **Post-Transcriptional Modifications:**
- After RNA is synthesized in the nucleus, it often undergoes modifications before it is functional. These modifications can include the addition of a 5' cap and a poly-A tail, as well as splicing.

5. **RNA in Cytoplasm:**
- Once the RNA is fully processed, it exits the nucleus and enters the cytoplasm. In the cytoplasm, mRNA is translated into proteins by ribosomes.

6. **Conclusion:**
- Since RNA is formed in the nucleus and also exists in the cytoplasm, the correct answer to the question is that ribonucleic acid occurs in both the nucleus and cytoplasm.

**Final Answer:**
- Ribonucleic acid occurs in: **C) Nucleus and Cytoplasm**

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