{"id":87988,"date":"2025-06-01T06:59:10","date_gmt":"2025-06-01T06:59:10","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87988"},"modified":"2025-06-01T06:59:10","modified_gmt":"2025-06-01T06:59:10","slug":"when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of\/","title":{"rendered":"When yeast cells are O\u2082 starved, fermentation serves as the source of"},"content":{"rendered":"

When yeast cells are O\u2082 starved, fermentation serves as the source of energy. This results in the production of :<\/p>\n

[amp_mcq option1=”ATP + CO\u2082 + Ethanol” option2=”ATP + O\u2082 + Pyruvate” option3=”ATP + CO\u2082 + Lactic acid” option4=”ATP + O\u2082 + Acetaldehyde” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nWhen yeast cells are deprived of oxygen, they switch from aerobic respiration to anaerobic fermentation to regenerate NAD\u207a needed for glycolysis. Glycolysis is the initial stage where glucose is broken down into pyruvate, producing a small amount of ATP. In alcoholic fermentation, pyruvate is converted into acetaldehyde and then ethanol, with the release of carbon dioxide. The net products from the glucose under oxygen-starved conditions undergoing fermentation by yeast are ATP (produced during glycolysis), CO\u2082, and Ethanol.
\n<\/section>\n
\n– Yeast undergoes alcoholic fermentation under anaerobic conditions.
\n– Fermentation allows glycolysis to continue by regenerating NAD\u207a.
\n– Glycolysis produces ATP.
\n– Pyruvate is converted to acetaldehyde and then ethanol during alcoholic fermentation, releasing CO\u2082.
\n<\/section>\n
\nLactic acid fermentation is another type of fermentation that occurs in muscle cells and some bacteria, producing lactic acid instead of ethanol and CO\u2082. The primary purpose of fermentation is not to directly produce large amounts of ATP but to regenerate the NAD\u207a consumed during glycolysis, allowing ATP production via glycolysis to continue in the absence of oxygen.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

When yeast cells are O\u2082 starved, fermentation serves as the source of energy. This results in the production of : [amp_mcq option1=”ATP + CO\u2082 + Ethanol” option2=”ATP + O\u2082 + Pyruvate” option3=”ATP + CO\u2082 + Lactic acid” option4=”ATP + O\u2082 + Acetaldehyde” correct=”option1″] This question was previously asked in UPSC NDA-1 – 2023 Download PDFAttempt … <\/p>\n

Detailed SolutionWhen yeast cells are O\u2082 starved, fermentation serves as the source of<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1093],"tags":[1105,1117,1152],"class_list":["post-87988","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1105","tag-biology","tag-cell","no-featured-image-padding"],"yoast_head":"\nWhen yeast cells are O\u2082 starved, fermentation serves as the source of<\/title>\n<meta name=\"description\" content=\"When yeast cells are deprived of oxygen, they switch from aerobic respiration to anaerobic fermentation to regenerate NAD\u207a needed for glycolysis. Glycolysis is the initial stage where glucose is broken down into pyruvate, producing a small amount of ATP. In alcoholic fermentation, pyruvate is converted into acetaldehyde and then ethanol, with the release of carbon dioxide. The net products from the glucose under oxygen-starved conditions undergoing fermentation by yeast are ATP (produced during glycolysis), CO\u2082, and Ethanol. - Yeast undergoes alcoholic fermentation under anaerobic conditions. - Fermentation allows glycolysis to continue by regenerating NAD\u207a. - Glycolysis produces ATP. - Pyruvate is converted to acetaldehyde and then ethanol during alcoholic fermentation, releasing CO\u2082.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o\u2082-starved-fermentation-serves-as-the-source-of\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When yeast cells are O\u2082 starved, fermentation serves as the source of\" \/>\n<meta property=\"og:description\" content=\"When yeast cells are deprived of oxygen, they switch from aerobic respiration to anaerobic fermentation to regenerate NAD\u207a needed for glycolysis. Glycolysis is the initial stage where glucose is broken down into pyruvate, producing a small amount of ATP. In alcoholic fermentation, pyruvate is converted into acetaldehyde and then ethanol, with the release of carbon dioxide. The net products from the glucose under oxygen-starved conditions undergoing fermentation by yeast are ATP (produced during glycolysis), CO\u2082, and Ethanol. - Yeast undergoes alcoholic fermentation under anaerobic conditions. - Fermentation allows glycolysis to continue by regenerating NAD\u207a. - Glycolysis produces ATP. - Pyruvate is converted to acetaldehyde and then ethanol during alcoholic fermentation, releasing CO\u2082.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o\u2082-starved-fermentation-serves-as-the-source-of\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:59:10+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"When yeast cells are O\u2082 starved, fermentation serves as the source of","description":"When yeast cells are deprived of oxygen, they switch from aerobic respiration to anaerobic fermentation to regenerate NAD\u207a needed for glycolysis. Glycolysis is the initial stage where glucose is broken down into pyruvate, producing a small amount of ATP. In alcoholic fermentation, pyruvate is converted into acetaldehyde and then ethanol, with the release of carbon dioxide. The net products from the glucose under oxygen-starved conditions undergoing fermentation by yeast are ATP (produced during glycolysis), CO\u2082, and Ethanol. - Yeast undergoes alcoholic fermentation under anaerobic conditions. - Fermentation allows glycolysis to continue by regenerating NAD\u207a. - Glycolysis produces ATP. - Pyruvate is converted to acetaldehyde and then ethanol during alcoholic fermentation, releasing CO\u2082.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o\u2082-starved-fermentation-serves-as-the-source-of\/","og_locale":"en_US","og_type":"article","og_title":"When yeast cells are O\u2082 starved, fermentation serves as the source of","og_description":"When yeast cells are deprived of oxygen, they switch from aerobic respiration to anaerobic fermentation to regenerate NAD\u207a needed for glycolysis. Glycolysis is the initial stage where glucose is broken down into pyruvate, producing a small amount of ATP. In alcoholic fermentation, pyruvate is converted into acetaldehyde and then ethanol, with the release of carbon dioxide. The net products from the glucose under oxygen-starved conditions undergoing fermentation by yeast are ATP (produced during glycolysis), CO\u2082, and Ethanol. - Yeast undergoes alcoholic fermentation under anaerobic conditions. - Fermentation allows glycolysis to continue by regenerating NAD\u207a. - Glycolysis produces ATP. - Pyruvate is converted to acetaldehyde and then ethanol during alcoholic fermentation, releasing CO\u2082.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o\u2082-starved-fermentation-serves-as-the-source-of\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:59:10+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of\/","url":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of\/","name":"When yeast cells are O\u2082 starved, fermentation serves as the source of","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:59:10+00:00","dateModified":"2025-06-01T06:59:10+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"When yeast cells are deprived of oxygen, they switch from aerobic respiration to anaerobic fermentation to regenerate NAD\u207a needed for glycolysis. Glycolysis is the initial stage where glucose is broken down into pyruvate, producing a small amount of ATP. In alcoholic fermentation, pyruvate is converted into acetaldehyde and then ethanol, with the release of carbon dioxide. The net products from the glucose under oxygen-starved conditions undergoing fermentation by yeast are ATP (produced during glycolysis), CO\u2082, and Ethanol. - Yeast undergoes alcoholic fermentation under anaerobic conditions. - Fermentation allows glycolysis to continue by regenerating NAD\u207a. - Glycolysis produces ATP. - Pyruvate is converted to acetaldehyde and then ethanol during alcoholic fermentation, releasing CO\u2082.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/when-yeast-cells-are-o%e2%82%82-starved-fermentation-serves-as-the-source-of\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC NDA-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-nda-1\/"},{"@type":"ListItem","position":3,"name":"When yeast cells are O\u2082 starved, fermentation serves as the source of"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/87988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=87988"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/87988\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=87988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=87988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=87988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}