I have not yet understood which molecular mechanism recognises a particular series of triplet codons is whether coding or noncoding.
2006-08-11 08:15:22 · 5 answers · asked by Sreek n 1 in Science & Mathematics ➔ Biology
Study splicing chapter of Gene 8. u can find your answer completely.
2006-08-11 08:24:35 · answer #1 · answered by Captain B 1 · 0⤊ 0⤋
introns are noncoding (for proteins) segments of DNA, while exons are exported from the nucleus to be translated and expresed as proteins (hence exon). Particles called snRNPs (small nuclear ribonucleoproteins) form a spliceosome which recognise a few nucleotides either side of the intron. They bind and splice at these points. One idea is the introns play a regulatory role in the cell maybe by influencing gene activity, or perhaps they make different proteins from a common gene depending on the nature of the differentiation of a cell. Also, exons code for the active domains of a protein, so recombination within split genes may bring together widely separated coding regions.
2006-08-11 15:33:12 · answer #2 · answered by Allasse 5 · 1⤊ 0⤋
triplet codons in the introns are not translated because they are spliced out before u get to that step... before u translate u have to process the primary transcript... within that primary transcript, ull find conserved sequences that mark the start and end of an intron (the middle part isnt important)... this concept is important because if those introns are part of the mRNA and they do happened to b translated, then u wouldn't get the right protein...
2006-08-11 19:01:27 · answer #3 · answered by Toni E 1 · 0⤊ 0⤋
Okay I took gene expression last year so I'm kind of rusty....
Splicing proteins recognize specific sequences in introns....the sequences usually flank the introns themselves although i think there are sequences within the introns themselves that are recognized also.....
ANyways....particular splicing proteins recognize particular sequence...which is why sometimes you get splice varients of proteins....
The splicing proteins loop out the intron and fuse the exons...
wish i had protein names for ya...try wikipedia or do a google search on intron splicing
2006-08-11 15:26:37 · answer #4 · answered by Franklin 7 · 0⤊ 0⤋
I wish I could remember the answer to this... I've been out of school too long and haven't used any of my biology knowledge in years.
2006-08-11 15:20:46 · answer #5 · answered by Stumpy 4 · 0⤊ 0⤋