{"id":262882,"date":"2025-07-20T21:16:28","date_gmt":"2025-07-20T21:16:28","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=262882"},"modified":"2025-07-20T21:16:30","modified_gmt":"2025-07-20T21:16:30","slug":"which-of-these-amino-acids-are-synthesized-using-the-tca-cycle-intermediate-2-oxoglutarate-also-known-as-alpha-keto-glutarate-as-a-starting-point","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/20\/which-of-these-amino-acids-are-synthesized-using-the-tca-cycle-intermediate-2-oxoglutarate-also-known-as-alpha-keto-glutarate-as-a-starting-point\/","title":{"rendered":"Which of these amino acids are synthesized using the TCA cycle-intermediate 2-oxoglutarate (also known as alpha keto-glutarate) as a starting point"},"content":{"rendered":"\n<p>? Group of answer choices alanine arginine asparagine glycine glutamate glutamine phenylalanine proline tryptophan tyrosine<\/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>The amino acids that are synthesized using <strong>2-oxoglutarate<\/strong> (also known as <strong>alpha-ketoglutarate<\/strong>) as a starting point are <strong>glutamate<\/strong>, <strong>glutamine<\/strong>, <strong>proline<\/strong>, and <strong>arginine<\/strong>.<\/p>\n\n\n\n<p>Here&#8217;s an explanation:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>Glutamate<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>2-oxoglutarate<\/strong> is directly involved in the synthesis of glutamate. Through <strong>reductive amination<\/strong>, <strong>2-oxoglutarate<\/strong> accepts an amino group from glutamate dehydrogenase (GDH) to form glutamate. This reaction is important for maintaining amino acid balance in cells and is a key process in nitrogen metabolism.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Glutamine<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Glutamine is synthesized from <strong>glutamate<\/strong> through an enzyme called <strong>glutamine synthetase<\/strong>, which adds an additional amino group to <strong>glutamate<\/strong>, forming <strong>glutamine<\/strong>. Thus, glutamine is indirectly derived from <strong>2-oxoglutarate<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Proline<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Proline<\/strong> is synthesized from <strong>glutamate<\/strong> in a two-step process. First, <strong>glutamate<\/strong> is reduced to <strong>glutamate-5-semialdehyde<\/strong>, and then it undergoes a cyclization reaction to form <strong>proline<\/strong>. So, <strong>proline<\/strong> is another amino acid that is ultimately derived from <strong>2-oxoglutarate<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>Arginine<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The synthesis of <strong>arginine<\/strong> also involves <strong>glutamate<\/strong>. The process begins with <strong>glutamate<\/strong> being converted into <strong>ornithine<\/strong> via a series of enzymatic reactions, and then <strong>ornithine<\/strong> is converted into <strong>arginine<\/strong>. Therefore, <strong>arginine<\/strong> is another amino acid whose synthesis is dependent on <strong>2-oxoglutarate<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Other Amino Acids:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Amino acids such as <strong>alanine<\/strong>, <strong>asparagine<\/strong>, <strong>glycine<\/strong>, <strong>phenylalanine<\/strong>, <strong>tyrosine<\/strong>, and <strong>tryptophan<\/strong> do not directly derive from <strong>2-oxoglutarate<\/strong>. These amino acids are synthesized from other precursors or pathways. For example, <strong>alanine<\/strong> is derived from pyruvate, while <strong>phenylalanine<\/strong> and <strong>tyrosine<\/strong> are derived from <strong>phenylalanine<\/strong> and <strong>tyrosine<\/strong> biosynthetic pathways.<\/li>\n<\/ul>\n\n\n\n<p>Thus, <strong>glutamate<\/strong>, <strong>glutamine<\/strong>, <strong>proline<\/strong>, and <strong>arginine<\/strong> are the amino acids synthesized using <strong>2-oxoglutarate<\/strong> as a precursor.<\/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-banner6-1254.jpeg\" alt=\"\" class=\"wp-image-262883\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>? Group of answer choices alanine arginine asparagine glycine glutamate glutamine phenylalanine proline tryptophan tyrosine The Correct Answer and Explanation is: The amino acids that are synthesized using 2-oxoglutarate (also known as alpha-ketoglutarate) as a starting point are glutamate, glutamine, proline, and arginine. Here&#8217;s an explanation: 1. Glutamate: 2. Glutamine: 3. Proline: 4. Arginine: Other [&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-262882","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/262882","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=262882"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/262882\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=262882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=262882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=262882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}