{"id":252414,"date":"2025-07-11T09:17:14","date_gmt":"2025-07-11T09:17:14","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=252414"},"modified":"2025-07-11T09:17:17","modified_gmt":"2025-07-11T09:17:17","slug":"summarize-the-inputs-and-outputs-of-the-citric-acid-cycle","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/11\/summarize-the-inputs-and-outputs-of-the-citric-acid-cycle\/","title":{"rendered":"Summarize the inputs and outputs of the citric acid cycle"},"content":{"rendered":"\n<p>4) Summarize the inputs and outputs of the citric acid cycle (Krebs cycle): 3. What goes in? b. What comes out? gain of ATP per glucose? Has any ATP been produced? If so, what is the net C. citric acid cycle take place in eukaryotes? d Where does the<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Summary of the Citric Acid Cycle (Krebs Cycle):<\/strong><\/p>\n\n\n\n<p><strong>a. What goes in?<\/strong><br>The citric acid cycle begins when <strong>acetyl-CoA<\/strong> enters the cycle. This molecule is derived from the breakdown of carbohydrates, fats, and proteins. Each glucose molecule produces two molecules of acetyl-CoA. The cycle also requires <strong>NAD\u207a<\/strong>, <strong>FAD<\/strong>, and <strong>ADP<\/strong> as inputs, which are used as electron carriers and energy currency precursors.<\/p>\n\n\n\n<p><strong>b. What comes out?<\/strong><br>For each acetyl-CoA molecule that enters the cycle, the outputs are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>3 NADH<\/strong> molecules<\/li>\n\n\n\n<li><strong>1 FADH\u2082<\/strong> molecule<\/li>\n\n\n\n<li><strong>1 ATP<\/strong> (or GTP, which is functionally equivalent)<\/li>\n\n\n\n<li><strong>2 CO\u2082<\/strong> molecules<\/li>\n<\/ul>\n\n\n\n<p>Since one glucose molecule generates two acetyl-CoA molecules, the cycle turns twice per glucose. Therefore, the total outputs per glucose are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>6 NADH<\/strong><\/li>\n\n\n\n<li><strong>2 FADH\u2082<\/strong><\/li>\n\n\n\n<li><strong>2 ATP<\/strong><\/li>\n\n\n\n<li><strong>4 CO\u2082<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>c. Gain of ATP per glucose? Has any ATP been produced?<\/strong><br>Yes, ATP is produced. The citric acid cycle directly produces <strong>2 ATP<\/strong> molecules per glucose (1 per cycle turn). However, the main energy gain comes from the high-energy electron carriers. These NADH and FADH\u2082 molecules proceed to the electron transport chain, where much more ATP is generated. In total, the NADH and FADH\u2082 produced by the citric acid cycle contribute to the production of approximately <strong>22 ATP<\/strong> through oxidative phosphorylation.<\/p>\n\n\n\n<p><strong>d. Where does the citric acid cycle take place in eukaryotes?<\/strong><br>In eukaryotic cells, the citric acid cycle occurs in the <strong>mitochondrial matrix<\/strong>, which is the innermost compartment of the mitochondria. This organelle is often called the powerhouse of the cell because of its role in energy production.<\/p>\n\n\n\n<p>In summary, the citric acid cycle is central to cellular respiration. It oxidizes acetyl-CoA to CO\u2082, reduces NAD\u207a and FAD to NADH and FADH\u2082, and generates ATP, all within the mitochondria of eukaryotic cells<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner6-233.jpeg\" alt=\"\" class=\"wp-image-252423\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>4) Summarize the inputs and outputs of the citric acid cycle (Krebs cycle): 3. What goes in? b. What comes out? gain of ATP per glucose? Has any ATP been produced? If so, what is the net C. citric acid cycle take place in eukaryotes? d Where does the The Correct Answer and Explanation is: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-252414","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/252414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=252414"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/252414\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=252414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=252414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=252414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}