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  • (a) Describe the process of transcription in bacteria. (b) Explain the processing the hRNA needs to undergo before becoming functional mRNA in eukaryotes.      

(a) Describe the process of transcription in bacteria.

(b) Explain the processing the hRNA needs to undergo before becoming functional mRNA in eukaryotes.

 

 

 

 
 
 
 
 

Answers (1)

(a) Initiation - Enzyme (DNA dependent RNA polymerase) RNA polymerase binds with sigma factor and attaches to the promoter site , i.e, 5' site of the DNA.

Elongation - When RNA polymerase moves from the promoter to the terminator site it causes the polymerisation of nucleoside triphosphate / nucleotides resulting in the formation of RNA (in the 5' - 3' direction ) 

Termination - RNA polymerase on reaching the terminator site binds to p factor and the (nascent transcribesd) RNA falls off along with RNA polymerase.

Important Questions for CBSE Class 12 Biology The DNA and RNA World

(b) hRNA undergoes splicing where introns are removed and exons are joined in a defined order.

hnRNA undergoes additional processing, i.e, capping (addition to the 5' end), tailing (200 - 300 polyadenylated residue are added to the 3' end).

 

 

Posted by

Priyanka Kumari

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