{"id":209041,"date":"2025-04-28T09:55:57","date_gmt":"2025-04-28T09:55:57","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=209041"},"modified":"2025-04-28T09:55:59","modified_gmt":"2025-04-28T09:55:59","slug":"in-lactate-fermentation","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/28\/in-lactate-fermentation\/","title":{"rendered":"In lactate fermentation"},"content":{"rendered":"\n<p>In lactate fermentation, NAD+ is produced during:<\/p>\n\n\n\n<p>the oxidation of glucose.<br>reduction of pyruvate to lactic acid.<br>hydrolysis of ATP to ADP.<br>reduction of acetaldehyde to ethanol.<br>oxidation of pyruvate to acetyl CoA.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is: <strong>reduction of pyruvate to lactic acid<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>Lactate fermentation is a type of <strong>anaerobic respiration<\/strong> that occurs when oxygen is scarce or unavailable, such as in muscle cells during intense exercise. The goal of fermentation is to <strong>regenerate NAD+<\/strong>, which is necessary for <strong>glycolysis<\/strong> to continue producing ATP.<\/p>\n\n\n\n<p>Let&#8217;s walk through the process:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Glycolysis<\/strong> first breaks down one molecule of glucose (a six-carbon sugar) into two molecules of <strong>pyruvate<\/strong> (a three-carbon compound). In this process, two molecules of <strong>NAD+ are reduced to NADH<\/strong> as they accept electrons. Glycolysis also generates a net gain of two ATP molecules.<\/li>\n\n\n\n<li>Under <strong>aerobic conditions<\/strong> (when oxygen is present), pyruvate enters the mitochondria and is fully oxidized through the citric acid cycle and electron transport chain, regenerating NAD+ in the process.<\/li>\n\n\n\n<li>However, under <strong>anaerobic conditions<\/strong>, the electron transport chain cannot operate because there is no final electron acceptor (oxygen). As a result, NADH builds up, and NAD+ becomes scarce. Without NAD+, glycolysis would halt because NAD+ is essential for the step in glycolysis where glyceraldehyde-3-phosphate is oxidized.<\/li>\n\n\n\n<li>To solve this problem, cells use <strong>lactate fermentation<\/strong>. In this pathway, the accumulated pyruvate is <strong>reduced<\/strong> to <strong>lactic acid (lactate)<\/strong> by the enzyme <strong>lactate dehydrogenase<\/strong>. During this reaction, <strong>NADH is oxidized back to NAD+<\/strong>.<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The reaction:<br><strong>Pyruvate + NADH \u2192 Lactate + NAD\u207a<\/strong><\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>This regeneration of NAD+ allows glycolysis to continue producing ATP even when oxygen is unavailable.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>In summary, <strong>NAD+ is regenerated during the reduction of pyruvate to lactic acid<\/strong> in lactate fermentation. This critical step ensures a continuous supply of ATP through glycolysis in anaerobic conditions. Without it, cells would quickly run out of energy when oxygen levels drop.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In lactate fermentation, NAD+ is produced during: the oxidation of glucose.reduction of pyruvate to lactic acid.hydrolysis of ATP to ADP.reduction of acetaldehyde to ethanol.oxidation of pyruvate to acetyl CoA. The correct answer and explanation is : The correct answer is: reduction of pyruvate to lactic acid. Explanation: Lactate fermentation is a type of anaerobic respiration [&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-209041","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/209041","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=209041"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/209041\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=209041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=209041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=209041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}