Post-transcriptional processing of nearly all mRNA primary transcripts occurs in eukaryotic cells. Introns are removed and exons are joined in the process of RNA splicing. An intron usually contains a clear splicing signal, which are short sequences framing the intron as well as an internal sequence called the branch site. Sometimes a regulatory protein may mask the splicing signal, resulting in alternative processing. RNA splicing occurs by two transesterification reactions, not hydrolysis followed by ligation as might be expected.
 The WikiPremed MCAT Course is a comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum. Please read our policies on Privacy and Shipping & Returns. Contact Us. MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course. WikiPremed offers the customers of our publications or our teaching services no guarantees regarding eventual performance on the MCAT.
WikiPremed is a trademark of Wisebridge Learning Systems LLC. The work of WikiPremed is published under a Creative Commons Attribution NonCommercial ShareAlike License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions. |