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2.09:_Polypeptides
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<figure><img style="width: 302px; height: 305px;" class="internal" alt="Glycine, alanine and cysteine join to form a tripeptide, releasing two water molecules." loading="lazy" width="302px" height="305px" src="https://bio.libretexts.org/@api/deki/files/5148/tripeptide.png?revision=1&size=bestfit&width=302&height=305" aria-describedby="remedy-description-4068c9360690f8ec" /><span id="remedy-description-4068c9360690f8ec" data-remedy-image-description="4068c9360690f8ec" style="display: block; white-space: pre-line;">The upper row shows separate glycine, alanine and cysteine structures. Shaded regions identify atoms removed as H2O during condensation. A downward arrow leads to one connected chain with side chains H, CH3 and CH2SH in that order. Two red marks and arrows label the new carbon???nitrogen peptide bonds.</span><figcaption>Figure 2.9.2: A longer peptide.</figcaption></figure> <p class="lt-bio-3787" style="background-color: unset;">The sequence of amino acids in a polypeptide is dictated by the codons in the messenger RNA (mRNA) molecules from which the polypeptide was translated. The sequence of codons in the mRNA was, in turn, dictated by the sequence of codons in the DNA from which the mRNA was transcribed. Proteins are made up of one or more polypeptide molecules.</p> <footer class="mt-content-footer"> <style>/*<![CDATA[*/#mt-toc-container {display: none !important;}/*]]>*/</style><script type="text/javascript">/*<![CDATA[*/ $(function() { if(!window['autoDefinitionList']){ window['autoDefinitionList'] = true; $('dl').find('dt').on('click', function() { $(this).next().toggle('350'); }); } });/*]]>*/</script> <script defer="true" src="https://static.cloudflareinsights.com/beacon.min.js" data-cf-beacon="{"token": "483ec2414e274209a7e93c253192df0b"}"></script><script src="https://cdn.libretexts.net/github/LibreTextsMain/Miscellaneous/h5p-resizer.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/4.2.11/iframeResizer.contentWindow.min.js" integrity="sha512-FOf4suFgz7OrWmBiyyWW48u/+6GaaAFSDHagh2EBu/GH/1+OQSYc0NFGeGeZK0gZ3vuU1ovmzVzD6bxmT4vayg==" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/iframe-resizer/4.2.11/iframeResizer.min.js" integrity="sha512-HY1lApSG7xxx8mYzs/lxRs+c5AaDThRaa3pvQB6puiswvf2lWqMJVf+8qSGiL4ZXfHQoPIqbd1TlpqfycPo3cQ==" crossorigin="anonymous"></script><script>/*<![CDATA[*/window.addEventListener('load', function(){$('iframe').iFrameResize({warningTimeout:0, scrolling: 'omit'});})/*]]>*/</script><script>/*<![CDATA[*/ window.PageNum = "auto"; window.InitialOffset = "false"; window.PageName = "2.9: Polypeptides"; /*]]>*/</script> <hr class="autoattribution-divider" /><div class="autoattribution"><p>This page titled <a target="_blank" class="internal mt-self-link" href="/Sandboxes/johnnyphung/biology/02:_The_Molecules_of_Life/2.09:_Polypeptides">2.9: Polypeptides</a> is shared under a <a rel="nofollow" href="https://creativecommons.org/licenses/by/3.0" target="_blank">CC BY 3.0 (creativecommons.org)</a> license and was authored, remixed, and/or curated by <a rel="nofollow" target="_blank" href="http://www.biology-pages.info/">John W. Kimball (biology-pages.info)</a> via <a rel="nofollow" href="https://www.biology-pages.info/" target="_blank">source content (biology-pages.info)</a> that was edited to the style and standards of the LibreTexts platform.</p></div> <script type="text/javascript">/*<![CDATA[*/ try { const pageTagsHolder = document.getElementById('pageTagsHolder'); if (pageTagsHolder) { const pageTagsRaw = pageTagsHolder.innerText; if (pageTagsRaw.includes('transcluded:yes')) { const attrSections = document.querySelectorAll('.autoattribution'); const attrDividers = document.querySelectorAll('.autoattribution-divider'); if (attrSections.length > 1 && attrDividers.length > 1) { /* Hide first AutoAttribution from transcluded page */ attrSections[0].style.display = 'none'; attrDividers[0].style.display = 'none'; } } } } catch (e) { console.error('[AutoAttribution Transclusion Removal] Error encountered!'); console.error(e); }/*]]>*/</script> <div id="librelens-attribution-list"></div></footer>
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