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Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question 29
A trisaccharide was isolated from a new species of red algae. The sample was hydrolyzed and monosaccharide units were analyzed in different colorimetric tests. Based on the data below, what are the identity of monosaccharide A, B, and C?
Test
Monosaccharide A
Monossacharide B
Monosaccharide C
Brick-red ppt
bluish-green solution
Brick-red ppt
light yellow solution
Brick-red ppt
light yellow solution
Benedict's Test
Bial's Orcinol Test
Seliwanoff's Test
light yellow solution
Cherry-red solution
light yellow solution
Broken-glass
crystals formed
Broad flat crystals
Concentrated nitric
No crystals formed
No crystals formed
acid Test
Long fine-needle like
crystals formed
Osazone Test
Needle-like crystals
formed at ~2 min
formed
O A = mannose, B= fructose, C=xylose
O A=galactose, B= fructose, C=xylose
O A= xylose, B=mannose, C= fructose
O A=galactose, B=xylose, C=fructose
O A=xylose, B= fructose, C=mannose
O A= fructose, B=mannose, c=xylose
O A= xylose, B= fructose, C=galactose
O A= fructose, B= xylose, C=galactose
Transcribed Image Text:Question 29 A trisaccharide was isolated from a new species of red algae. The sample was hydrolyzed and monosaccharide units were analyzed in different colorimetric tests. Based on the data below, what are the identity of monosaccharide A, B, and C? Test Monosaccharide A Monossacharide B Monosaccharide C Brick-red ppt bluish-green solution Brick-red ppt light yellow solution Brick-red ppt light yellow solution Benedict's Test Bial's Orcinol Test Seliwanoff's Test light yellow solution Cherry-red solution light yellow solution Broken-glass crystals formed Broad flat crystals Concentrated nitric No crystals formed No crystals formed acid Test Long fine-needle like crystals formed Osazone Test Needle-like crystals formed at ~2 min formed O A = mannose, B= fructose, C=xylose O A=galactose, B= fructose, C=xylose O A= xylose, B=mannose, C= fructose O A=galactose, B=xylose, C=fructose O A=xylose, B= fructose, C=mannose O A= fructose, B=mannose, c=xylose O A= xylose, B= fructose, C=galactose O A= fructose, B= xylose, C=galactose
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