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?

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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Question

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?




 

   

A= fructose, B=mannose, C=xylose

   

A= xylose, B=mannose, C= fructose

   

A = mannose, B= fructose, C=xylose

   

A= xylose, B= fructose, C=galactose

   

A=galactose, B= fructose, C=xylose

   

A=xylose, B= fructose, C=mannose

   

A= fructose, B= xylose, C=galactose

   

A=galactose, B=xylose, C=fructose

Test
Monosaccharide A
Monossacharide B
Monosaccharide C
Benedict's Test
Bial's Orcinol Test
Brick-red ppt
bluish-green solution light yellow solution
Brick-red ppt
Brick-red ppt
light yellow solution
Seliwanoff's Test
light yellow solution
Cherry-red solution
light yellow solution
No crystals formed
Broken-glass
crystals formed
Broad flat crystals
formed
Concentrated nitric
acid Test
No crystals formed
Long fine-needle like
crystals formed
Needle-like crystals
formed at -2 min
Osazone Test
Transcribed Image Text:Test Monosaccharide A Monossacharide B Monosaccharide C Benedict's Test Bial's Orcinol Test Brick-red ppt bluish-green solution light yellow solution Brick-red ppt Brick-red ppt light yellow solution Seliwanoff's Test light yellow solution Cherry-red solution light yellow solution No crystals formed Broken-glass crystals formed Broad flat crystals formed Concentrated nitric acid Test No crystals formed Long fine-needle like crystals formed Needle-like crystals formed at -2 min Osazone Test
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