What is the role of eukaryotic RNA polymerase I?a)Transcription of mRNA only.b)Transcription of mRNA, rRNA and tRNA.Correct answer is option ''. Can you explain this answer?

Question

Answer

Role of Eukaryotic RNA Polymerase I:
Eukaryotic RNA Polymerase I plays a crucial role in transcription within the nucleus of eukaryotic cells. It is responsible for transcribing a specific type of RNA molecule known as ribosomal RNA (rRNA). Below are the key roles of RNA Polymerase I:

Transcription of rRNA:
- RNA Polymerase I is primarily involved in transcribing rRNA genes, which are essential for the assembly of ribosomes. Ribosomes are responsible for protein synthesis within the cell, making rRNA crucial for cellular function.
- The transcribed rRNA is processed and modified to form the different components of the ribosome, including the small and large subunits.

Transcription of tRNA:
- While RNA Polymerase I is not directly responsible for transcribing tRNA genes, it plays a role in the transcription of some tRNA genes in certain organisms.
- In some eukaryotic cells, RNA Polymerase III transcribes the majority of tRNA genes, but RNA Polymerase I may also be involved in transcribing specific tRNA genes.

Conclusion:
In conclusion, Eukaryotic RNA Polymerase I primarily plays a key role in transcribing rRNA genes, which are essential for ribosome assembly and protein synthesis. While it is not the main enzyme responsible for transcribing tRNA genes, it may also have a role in transcribing specific tRNA genes in certain organisms.

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