What carbohydrate(s) would have the following test results?<\/p>\n\n\n\n
Produces a reddish-orange solid with Benedict’s and a red color with Seliwanoff’s reagent in 1 minute.
Gives a color change with Benedict’s test, a light solar with Seliwanoff’s reagent after 5 minutes, and produces bubbles during fermentation.
Gives no color change with Benedict’s or Seliwanoff’s test, but turns a blue-black color with iodine reagent.
E. Hydrolysis of Disaccharides and Polysaccharides<\/p>\n\n\n\n
How do the results of the Benedict’s test indicate that hydrolysis of sucrose and starch occurred?<\/p>\n\n\n\n
The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n To determine which carbohydrate(s) match the described test results and to understand how the Benedict’s test<\/strong> indicates hydrolysis, let’s break down each statement and what it reveals:<\/p>\n\n\n\n “Produces a reddish-orange solid with Benedict’s and a red color with Seliwanoff’s reagent in 1 minute.”<\/strong><\/p>\n\n\n\n \u2705 Answer: Fructose<\/strong><\/p>\n\n\n\n “Gives a color change with Benedict’s test, a light color with Seliwanoff’s reagent after 5 minutes, and produces bubbles during fermentation.”<\/strong><\/p>\n\n\n\n \u2705 Answer: Glucose<\/strong><\/p>\n\n\n\n “Gives no color change with Benedict’s or Seliwanoff’s test, but turns a blue-black color with iodine reagent.”<\/strong><\/p>\n\n\n\n \u2705 Answer: Starch<\/strong><\/p>\n\n\n\n How do the results of the Benedict’s test indicate that hydrolysis of sucrose and starch occurred?<\/strong><\/p>\n\n\n\n Benedict\u2019s test shows a color change (from blue to green\/yellow\/orange\/red) after hydrolysis, indicating the formation of reducing sugars.<\/strong><\/p>\n\n\n\n The Benedict\u2019s test detects reducing sugars<\/strong>, which are carbohydrates with free aldehyde or ketone groups capable of reducing copper (II) ions in the reagent to copper (I), forming a colored precipitate. Normally, sucrose<\/strong> (a disaccharide composed of glucose and fructose) and starch<\/strong> (a polysaccharide made of glucose units) do not<\/strong> test positive with Benedict\u2019s reagent because their glycosidic bonds prevent free aldehyde or ketone groups from being exposed.<\/p>\n\n\n\n However, when hydrolysis<\/strong> occurs\u2014either through acid or enzymatic action\u2014these glycosidic bonds are broken<\/strong>, releasing the monosaccharide units<\/strong>. In the case of sucrose, hydrolysis yields glucose and fructose<\/strong>, both of which are reducing sugars. Once free, these monosaccharides can now react with Benedict\u2019s reagent, producing the characteristic red-orange precipitate. Thus, a previously negative Benedict’s test becomes positive<\/strong>, signaling that hydrolysis has occurred.<\/p>\n\n\n\n For starch<\/strong>, hydrolysis breaks the polysaccharide into maltose<\/strong> and eventually into glucose<\/strong>. As the large, non-reducing starch molecules break down into smaller, reducing sugars, a positive Benedict\u2019s result<\/strong> appears. Before hydrolysis, starch only reacts with iodine<\/strong>, not Benedict\u2019s. But after hydrolysis, Benedict\u2019s test becomes positive, indicating the formation of glucose.<\/p>\n\n\n\n In conclusion, a color change in Benedict\u2019s test after hydrolysis<\/strong> clearly indicates that non-reducing sugars like sucrose and starch have been converted into their reducing sugar components. This transformation is the key indicator of hydrolysis having occurred, making Benedict\u2019s reagent a useful tool in identifying both the presence of reducing sugars and the successful breakdown of complex carbohydrates.<\/p>\n","protected":false},"excerpt":{"rendered":" What carbohydrate(s) would have the following test results? Produces a reddish-orange solid with Benedict’s and a red color with Seliwanoff’s reagent in 1 minute.Gives a color change with Benedict’s test, a light solar with Seliwanoff’s reagent after 5 minutes, and produces bubbles during fermentation.Gives no color change with Benedict’s or Seliwanoff’s test, but turns a […]<\/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-215963","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/215963","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=215963"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/215963\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=215963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=215963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=215963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\nTest Result 1<\/strong><\/h3>\n\n\n\n
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\n\n\n\nTest Result 2<\/strong><\/h3>\n\n\n\n
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\n\n\n\nTest Result 3<\/strong><\/h3>\n\n\n\n
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\n\n\n\nHydrolysis of Disaccharides and Polysaccharides (E)<\/strong><\/h3>\n\n\n\n
\u2705 Correct Answer:<\/h3>\n\n\n\n
\u2705 Explanation (300+ words):<\/h3>\n\n\n\n