Question

Describe and provide the rationales for mRNA processing in eukaryotic cells. Include the following terms: cap, tail, introns, and exons.

Answer 1

solutiosolution-All leaving things must have methods for regulating their genes by controlling when their genes are expressed,we humans don't have operons humans remember are eukaryotes unlike prokaryotic bacteria cluster of related genes absent in eukaryotes

IN EUKARYOTES there are atleast three RNA polymerase in the nucleus.there are division of labour and the RNA polymerase I transcribes RNA,the RNA polymerase II transcribes precursor of mRNA and the RNA polymerase III is responsible for transcription of tRNA

2- the primary transcriptis contain both the exons and the introns and are non functional. mRNA undergoes additional processing called CAPPING AND TAILINGS

in capping unusual nucleotide is added to the 5'-end of hnRNA

IN TAILING adenylate residues (200-300) are added at 3'end in a template independent manner, it is the fully processed hnRNA now called mRNA

the most important aspects of RNA that we have to discuss as through the question are

1-exons- Eukaryotic genes that are split up into some parts and expressed as RNA product and some are not that product that part which can be expressed exons.

the coding sequences or expressed sequence are defined as exons.exons are said to be those sequence that appear in mature or processed RNA ,while the exons are interrupted by introns,introns or intervening sequences do not appear in mature or processed RNA