Question

complexity associated with transcription both in eukaryotic and prokaryotic. ​

Answer 1

Answer:

Gene expression is linked to RNA transcription, which cannot happen .... Thus, while eukaryotic transcription is far more complex than bacterial ...

Answer 2

Answer:

● In prokaryotes:

○ There is no clear demarcation between cytosol and nucleus. Therefore, translation can begin even before transcription is completed. Thus, in prokaryotes, transcription and translation are coupled.

● In eukaryotes:

○ Three different kinds of RNA polymerases are present.RNA polymerase I transcribes rRNA. RNA polymerase II transcribes hnRNA (mRNA precursor).RNA polymerase III transcribes tRNA, snRNA, and srRNA.

○ The precursor of mRNA, i.e. hnRNA, contains both introns and exons. Introns are removed and exons are joined by a process called splicing.

○ Capping − In this, methyl guanosine triphosphate is added to the 5′ end of

hnRNA.

○ Tailing − In this, adenylate residues are added to the 3′ end of hnRNA.

○ When hnRNA is fully processed, it is known as mRNA, which is transported out of the nucleus to get translated.