Transcription/translation - Exons and introns
In most eukaryotic genes, coding regions (exons) are interrupted by noncoding regions (introns). During transcription, the entire gene is copied into a pre-mRNA, which includes exons and introns. During the process of RNA splicing, introns are removed and exons joined to form a contiguous coding sequence. This "mature" mRNA is ready for translation.
gene concept,translation 3,transcription
- ID: 15549
- Source: DNALC.DNAi
Promoters are DNA sequences located in the 5' region adjacent to the transcriptional start site.
The majority of eukaryotic mRNAs contain a tract of A residues at the end. These polyA-tails are not encoded in the DNA. Rather, they are added to the pre-mRNA "post-transcriptionally" (after transcription). The end of pre-mRNA is cut by a specific enzyme
The diagram represents a single strand of DNA containing a gene, in purple. Remember this gene is "read" in the 5' to 3' direction to produce an mRNA.
An image relating transcription and translation.
An animation shows how the DNA genetic "code" is made into protein.
Doctor Anil Malhotra discusses how transcription factors can turn genes on or off, possibly leading to increased or reduced risk of illness.
Use green fluorescent protein to tag expression of genes.
Transcription factors bind to DNA, RNA polymerase begins transcribing messanger RNA (mRNA) molecule from DNA.