{"id":136,"date":"2012-11-05T11:38:49","date_gmt":"2012-11-05T15:38:49","guid":{"rendered":"https:\/\/sites.owu.edu\/wolverton\/?page_id=136"},"modified":"2016-12-01T08:50:41","modified_gmt":"2016-12-01T13:50:41","slug":"light-reactions","status":"publish","type":"page","link":"https:\/\/sites.owu.edu\/wolverton\/teaching\/cell-bio\/light-reactions\/","title":{"rendered":"Light Reactions"},"content":{"rendered":"<p><!--:en--><\/p>\n<h2 id=\"links\">Links<\/h2>\n<p><a href=\"http:\/\/www.nature.com\/principles\/ebooks\/introduction-to-cell-biology-4570805\/4569894\">Principles Module 29<\/a><\/p>\n<p><a href=\"http:\/\/www.nature.com\/principles\/ebooks\/introduction-to-cell-biology-4570805\/4569882\/1\">Principles Module 30\u20131<\/a><\/p>\n<h2 id=\"objectives\">Objectives<\/h2>\n<ul>\n<li>Describe the components in the cell necessary to carry out the light reactions<\/li>\n<li>Explain the process of how light energy results in the formation of NADPH and ATP<\/li>\n<li>Discuss the flow of electrons from PSII to PSI<\/li>\n<\/ul>\n<h2 id=\"keypoints\">Key points<\/h2>\n<ul>\n<li>The structure of chlorophyll allows it to absorb light in the blue and red parts of the spectrum\n<ul>\n<li>chlorophyll is not free-floating in the chloroplast, but rather is bound to membrane proteins in the thylakoid<\/li>\n<li>the long fatty-acid chain on chlorophyll allows it to associate with the hydrophobic regions of these proteins<\/li>\n<\/ul>\n<\/li>\n<li>Photochemistry (the removal of an electron from chlorophyll) only occurs at photosynthetic reaction centers\n<ul>\n<li>reaction centers are surrounded by <em>light harvesting complex<\/em> proteins that act as antennas to harvest light<\/li>\n<li>transfer of energy between light-harvesting complex chlorophylls and reaction center chlorophylls is by resonance energy transfer<\/li>\n<\/ul>\n<\/li>\n<li>Electron flow through the reaction center creates a H+ gradient\n<ul>\n<li>flow is linear, with electrons re-supplied by the hydrolysis of H<sub>2<\/sub>O and reducing NADP<sup>+<\/sup> to NADPH<\/li>\n<li>the H+ gradient drives the formation of ATP from ADP and P<sub>i<\/sub><\/li>\n<li>the energy for this electron flow comes, ultimately, from light<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"questionsforpractice\">Questions for Practice<\/h2>\n<ul>\n<li>Compare and contrast the electron transport system of photosynthesis with that of respiration. Identify the electron donors, transporters, membranes, H<sup>+<\/sup> gradient, and terminal electron acceptor.<\/li>\n<li>Describe or draw the photosynthetic electron transport system.<\/li>\n<li>What role do the light harvesting complex proteins play in the light reactions?<\/li>\n<\/ul>\n<p><!--:--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Links Principles Module 29 Principles Module 30\u20131 Objectives Describe the components in the cell necessary to carry out the light reactions Explain the process of how light energy results in the formation of NADPH and ATP Discuss the flow of electrons from PSII to PSI Key points The structure of chlorophyll allows it to absorb [&hellip;]<\/p>\n","protected":false},"author":40,"featured_media":0,"parent":447,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-136","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/pages\/136","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/users\/40"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/comments?post=136"}],"version-history":[{"count":1,"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/pages\/136\/revisions"}],"predecessor-version":[{"id":504,"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/pages\/136\/revisions\/504"}],"up":[{"embeddable":true,"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/pages\/447"}],"wp:attachment":[{"href":"https:\/\/sites.owu.edu\/wolverton\/wp-json\/wp\/v2\/media?parent=136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}