Can you explain why the answer E ? And also why not A . A states that five member ring . Isn’t it should be six member ring? 1. Regarding cyclic structures of monosaccharides and cyclitols, such as myo-inositol shownbelow, the following is FALSE:2.HO.OHOHOHOHOHA. Some hexoses exist in the five-membered ring (hexofuranose) form.B. In aqueous solutions, equilibrium exists between five- and six-membered ring structures.C. In aqueous solutions, equilibrium exists between - and -hexopyranoses.D. In aqueous solutions, monosaccharides exist in equilibrium between the cyclic and linearopen-chain forms.НОmyo-inositolE. In aqueous solutions, cyclitols, such myo-inositol, exist in equilibrium between the cyclicand linear open-chain forms.F. Carbocyclic analogs of monosaccharides, such as myo-inositol (see above), are muchmore chemically and metabolically stable than monosaccharides.HOLactulose, a -glycoside that is not hydrolyzed by amylases, is used for treatment of portalencephalopathy. This condition is caused by an elevated level of ammonia in the brain dueto liver cirrhosis. What is the mechanism of lactulose action?НОOHEXOHOHOHOH

The false statement among the options provided is E: "In aqueous solutions, cyclitols, such…

Answered: Can you explain why the answer E ? And…

Can you explain why the answer E ? And also why not A . A states that five member ring . Isn’t it should be six member ring?

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

Problem 1P

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Question

Can you explain why the answer E ? And also why not A . A states that five member ring . Isn’t it should be six member ring?

1. Regarding cyclic structures of monosaccharides and cyclitols, such as myo-inositol shown
below, the following is FALSE:
2.
HO.
OH
OH
OH
OH
OH
A. Some hexoses exist in the five-membered ring (hexofuranose) form.
B. In aqueous solutions, equilibrium exists between five- and six-membered ring structures.
C. In aqueous solutions, equilibrium exists between - and -hexopyranoses.
D. In aqueous solutions, monosaccharides exist in equilibrium between the cyclic and linear
open-chain forms.
НО
myo-inositol
E. In aqueous solutions, cyclitols, such myo-inositol, exist in equilibrium between the cyclic
and linear open-chain forms.
F. Carbocyclic analogs of monosaccharides, such as myo-inositol (see above), are much
more chemically and metabolically stable than monosaccharides.
HO
Lactulose, a -glycoside that is not hydrolyzed by amylases, is used for treatment of portal
encephalopathy. This condition is caused by an elevated level of ammonia in the brain due
to liver cirrhosis. What is the mechanism of lactulose action?
НО
OH
EX
OH
OH
OH
OH

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