Tests Q2 From the results in Part B, which carbohydrates are ketoses? Q3 From the results in Part C, which carbohydrates give a positive fermentation test? 291abydodi) 101 2129T Q4 From the results in Part D, which carbohydrates give a blue-black color in the iodine test? peu15 1 2011 9203913 W les T Benedict’s (A) Seliwanoff’s (B) Fermentation (C) Iodine (D) Identifying an Unknown Carbohydrate Unknown No. B que gaisub1 101 125T aloibanol A What carbohydrate(s) is\/are in Results with Unknown 2920 Carbohydrates Presents 15118 ciolo) anisuben your unknown? noireinsmes S (ul) #shizadosnavio4 701 tesT onibol a enoitevised01 Questions and Problems Q5 What carbohydrate(s) would give the following test results? szolymA S (okoY) a. Produces a reddish-orange solid with Benedict’s reagent and a red color with Seliwanoff’s reagent in 1 minute b. Produces a color change with Benedict’s reagent, a light orange color with Seliwanoff’s reagent after 5 min, and produces no bubbles during fermentation<\/p>\n\n\n\n
The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n To answer these questions, let\u2019s analyze each test result and match it with the properties of carbohydrates:<\/p>\n\n\n\n Explanation:<\/strong> Explanation:<\/strong> Explanation:<\/strong> a. Produces a reddish-orange solid with Benedict’s reagent and a red color with Seliwanoff’s reagent in 1 minute.<\/strong><\/p>\n\n\n\n Explanation:<\/strong><\/p>\n\n\n\n b. Produces a color change with Benedict’s reagent, a light orange color with Seliwanoff’s reagent after 5 min, and produces no bubbles during fermentation.<\/strong><\/p>\n\n\n\n Explanation:<\/strong><\/p>\n\n\n\n Let me know if you need help refining or cross-checking the results!<\/p>\n","protected":false},"excerpt":{"rendered":" Tests Q2 From the results in Part B, which carbohydrates are ketoses? Q3 From the results in Part C, which carbohydrates give a positive fermentation test? 291abydodi) 101 2129T Q4 From the results in Part D, which carbohydrates give a blue-black color in the iodine test? peu15 1 2011 9203913 W les T Benedict’s (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-186925","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/186925","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=186925"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/186925\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=186925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=186925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=186925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\nQ2: From the results in Part B, which carbohydrates are ketoses?<\/strong><\/h3>\n\n\n\n
The Seliwanoff’s test is designed to distinguish ketoses (e.g., fructose) from aldoses (e.g., glucose) because ketoses react more rapidly with Seliwanoff\u2019s reagent, producing a deep red color within 1-2 minutes. Aldoses may eventually produce a color change, but it occurs much slower and is often light orange.
From the results, identify which carbohydrates gave a red color within 1 minute. Those are ketoses.<\/p>\n\n\n\n
\n\n\n\nQ3: From the results in Part C, which carbohydrates give a positive fermentation test?<\/strong><\/h3>\n\n\n\n
A positive fermentation test indicates that the carbohydrate can be metabolized by yeast to produce carbon dioxide (bubbles) and\/or alcohol. Typical fermentable carbohydrates include glucose, fructose, and sucrose. Non-fermentable carbohydrates like lactose and starch will not show bubbles.
Refer to the results to identify which carbohydrates produced gas during fermentation.<\/p>\n\n\n\n
\n\n\n\nQ4: From the results in Part D, which carbohydrates give a blue-black color in the iodine test?<\/strong><\/h3>\n\n\n\n
The iodine test detects the presence of starch or polysaccharides. A positive test gives a blue-black color, indicating the presence of helical polysaccharide chains. Monosaccharides (e.g., glucose) and disaccharides (e.g., sucrose) will not give a positive result. Identify which carbohydrate(s) produced a blue-black color in the iodine test.<\/p>\n\n\n\n
\n\n\n\nQ5: What carbohydrate(s) would give the following test results?<\/strong><\/h3>\n\n\n\n
\n
Answer<\/strong>: The carbohydrate is fructose<\/strong> because it is a reducing sugar and a ketose.<\/li>\n<\/ul>\n\n\n\n
\n\n\n\n\n
Answer<\/strong>: The carbohydrate is lactose<\/strong>, a reducing sugar and non-fermentable disaccharide.<\/li>\n<\/ul>\n\n\n\n
\n\n\n\nFinal Summary:<\/h3>\n\n\n\n
\n