{"id":197145,"date":"2025-03-06T17:52:02","date_gmt":"2025-03-06T17:52:02","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=197145"},"modified":"2025-03-06T17:52:05","modified_gmt":"2025-03-06T17:52:05","slug":"which-statement-describes-the-citric-acid-cycle-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/06\/which-statement-describes-the-citric-acid-cycle-2\/","title":{"rendered":"Which statement describes the citric acid cycle"},"content":{"rendered":"\n

Which statement describes the citric acid cycle?<\/p>\n\n\n\n

View Available Hint(s)for Part F<\/p>\n\n\n\n

This process splits glucose in half and produces 2 ?ATPs for each glucose.<\/p>\n\n\n\n

This process converts pyruvic acid to acetyl CoA.<\/p>\n\n\n\n

This process joins 2 ?pyruvic acid molecules into a molecule of glucose.<\/p>\n\n\n\n

This process uses energy captured from electrons flowing to oxygen to produce most of the ATPs in cellular respiration.<\/p>\n\n\n\n

This process produces some ATP and carbon dioxide in the mitochondrion.<\/p>\n\n\n\n

The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Correct Answer:<\/h3>\n\n\n\n

“This process produces some ATP and carbon dioxide in the mitochondrion.”<\/strong><\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

The citric acid cycle (Krebs cycle or TCA cycle)<\/strong> is a key metabolic pathway that takes place in the mitochondrial matrix<\/strong> of eukaryotic cells. It plays a crucial role in cellular respiration by oxidizing acetyl-CoA<\/strong> into carbon dioxide and capturing high-energy electrons used for ATP production.<\/p>\n\n\n\n

The cycle begins when acetyl-CoA<\/strong> (derived from pyruvate oxidation) combines with oxaloacetate<\/strong> to form citrate<\/strong>. This molecule then undergoes a series of enzyme-catalyzed transformations, during which it releases two molecules of carbon dioxide (CO\u2082)<\/strong> and generates energy-storing molecules: NADH, FADH\u2082, and ATP (or GTP in some cells).<\/strong> The cycle also regenerates oxaloacetate<\/strong>, ensuring that the process can continue.<\/p>\n\n\n\n

Key outputs of the citric acid cycle include:<\/p>\n\n\n\n

    \n
  1. 2 CO\u2082<\/strong> per cycle (waste product exhaled from the body).<\/li>\n\n\n\n
  2. 3 NADH and 1 FADH\u2082<\/strong>, which carry high-energy electrons to the electron transport chain (ETC)<\/strong> for ATP production.<\/li>\n\n\n\n
  3. 1 ATP (or GTP)<\/strong> directly produced via substrate-level phosphorylation<\/strong>.<\/li>\n<\/ol>\n\n\n\n

    While the citric acid cycle itself does not produce the majority of ATP in cellular respiration, it plays a fundamental role by providing the high-energy electrons necessary for ATP synthesis in the electron transport chain (ETC).<\/strong> This final step generates the bulk of ATP by harnessing the energy of electron flow and oxidative phosphorylation.<\/p>\n\n\n\n

    Since the cycle occurs in the mitochondria, it is exclusive to aerobic respiration<\/strong>, meaning it requires oxygen indirectly to function properly.<\/p>\n\n\n\n

    Now, I’ll generate an image illustrating the citric acid cycle.<\/p>\n\n\n\n

    Here is the detailed and labeled diagram of the citric acid cycle (Krebs cycle) occurring in the mitochondrion. It includes key molecules such as Acetyl-CoA, Citrate, Oxaloacetate, NADH, FADH\u2082, ATP, and CO\u2082, along with arrows indicating stepwise transformations. Let me know if you need any modifications or further explanations!<\/p>\n\n\n\n

    \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

    Which statement describes the citric acid cycle? View Available Hint(s)for Part F This process splits glucose in half and produces 2 ?ATPs for each glucose. This process converts pyruvic acid to acetyl CoA. This process joins 2 ?pyruvic acid molecules into a molecule of glucose. This process uses energy captured from electrons flowing to oxygen […]<\/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-197145","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/197145","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=197145"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/197145\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=197145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=197145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=197145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}