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Introns And Exons - Online Essay

Introns And Exons

AP. Biology essay
The finding of the Introns and the exons was one of the most significant
discoveries in genetics in the past fifteen years. split genes were discovered
when lack of relation between DNA sequences were seen during. DNA- mRNA
hybridation. For all new mRNA, they must be transcribed by RNA polymerase
enzymes. The transcription begins at the promoter sequence on the DNA and works
down, thus the nucleotide sequence of the mRNA is complimentary to the one of
DNA. In eukaryotes the mRNA is processed in the nucleus before transport to the
cytoplasm for translation. In order for the mRNA to become true functioning
RNA it must under go several stages of modification.
At ...

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regions. pre-mRNA
molecules are much longer than the mRNA molecule needed to code for its protein.
The regions that do not code for amino acids; aa, are scattered all along the
coding region. The genes are split with coding regions, called exons, short for
expressed regions; in between the exons the non-coding region called introns
exist. Before the translation of mRNA the introns must be spliced off.
Splicing is an complicated process for the cell. It must locate every intron in
the primary transcript. An average mRNA consists of eight to ten introns, some
even contain sixteen introns. exons, like introns are also spread apart. Some
of their codons may be split by introns, so information for a single amino acid
could be some distance apart. Splicing takes place in the nucleus but also
could take place in the cytoplasm and the mitochondria. After the splicing of
the introns, the G-caps and the Poly A tails remain on the mRNA.
A single gene can code for multiple proteins ...

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Introns And Exons. (2006, August 22). Retrieved November 23, 2024, from http://www.essayworld.com/essays/Introns-And-Exons/51189

"Introns And Exons." Essayworld.com. Essayworld.com, 22 Aug. 2006. Web. 23 Nov. 2024. <http://www.essayworld.com/essays/Introns-And-Exons/51189>

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PAPER DETAILS

Added: 8/22/2006 03:53:42 PM
Category: Science & Nature
Type: Free Paper
Words: 653
Pages: 3

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