Question

What is rDNA?
(a)Genomic RNA of the virus
(b)Genomic RNA that produces DNA through reverse transcription
(c)DNA found in the ribosome
(d)DNA segment specialized to form rRNA

Answer 1

Hint: It is a type of non-coding RNA that is the primary component of ribosomes, which is important for all cells. It is a ribozyme that carries out protein synthesis in ribosomes. This type of coding is transcribed from ribosomal DNA (rDNA) and then bound to ribosomal proteins to form small and large ribosomal subunits.

Complete answer:
Ribosomal DNA (rDNA) is a sequence of DNA that codes for ribosomal RNA. Ribosomes are assemblies of proteins and rRNA molecules that transform mRNA molecules into proteins. In the nucleus, the rDNA portion of the chromosome is visualized as a nucleolus that forms extended chromosome loops with rDNA.
 rRNA is the physical and mechanical factor of the ribosome that forces the transition of RNA (tRNA) and messenger RNA (mRNA) to process and turn the latter into proteins. Ribosomal RNA is the predominant type of RNA present in most cells; it makes up about 80 percent of cellular RNA despite the fact that it has never been converted into proteins. Ribosomes consist of approximately 60 percent rRNA and 40 percent ribosomal protein by mass.

Additional Information: Ribosome is composed of RNA and protein, and each ribosome consists of two different RNA-protein complexes, known as small and large subunits. ... In eukaryotes, ribosomes are ordered for protein synthesis from the nucleus where portions of DNA (genes) are transcribed to form messenger RNAs (mRNAs).
In the nucleus, the rDNA portion of the chromosome is visualized as a nucleolus that forms extended chromosome loops with rDNA. These rDNA regions are often referred to as nucleolar organizing regions, as they give rise to the nucleolus.
So, the correct answer is ‘DNA segment specialized to form rRNA’.

Note: -Form of RNA the main characteristics of which are:
-Each rRNA has a chain of different sizes, with secondary and tertiary structures.
-It is part of the ribosomal subunits as it binds to certain proteins.
-It is related to the synthesis of proteins.