rDNA is

A

Genomic Rna of virus

B

Genomic RNA that produces DNA through reverse transcription.

C

DNA found in ribosome

D

DNA segment specialised to form rRNA.

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding rDNA**: The term "rDNA" stands for ribosomal DNA. It is a specific type of DNA that is crucial for the synthesis of ribosomal RNA (rRNA). 2. **Identifying the Function of rDNA**: The primary function of rDNA is to code for ribosomal RNA. Ribosomal RNA is an essential component of ribosomes, which are the cellular structures responsible for protein synthesis. 3. **Location of rDNA**: In eukaryotic cells, rDNA is located in the nucleolus, a specialized region within the nucleus. This is where the synthesis of rRNA takes place. 4. **Structure of rDNA**: rDNA is organized in tandem repeats in the chromosomes, forming expanded chromosomal loops. This structure allows for the efficient production of rRNA. 5. **Conclusion**: Based on the above points, rDNA is best defined as a DNA segment that is specialized to form rRNA. ### Final Answer: rDNA is the DNA segment that is specialized to form rRNA. ---
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