From the cyclic structure of allose given, whether it is i) a furanose or pyranose form ii) Î±- or Î²- anomer iii) D or L sugar are to be stated. Concept introduction: The pyranose form is a cyclic hemiacetal form with a six membered ring formed by the nucleophilic addition of the â€“OH group on C 5 to the C 1 carbonyl group. The furanose form is a cyclic hemiacetal form with a five membered ring formed by the nucleophilic addition of the â€“OH group on C 5 to the C 2 carbonyl group. The orientation of â€“OH group differs in Î±- and Î²- anomers. In Î±- anomer the OH on C 1 is cis to the â€“OH at the lowest chirality center in Fischer projection, while in Î²- anomer the â€“OH on C 1 is trans to the â€“OH at the lowest chirality center in Fischer projection. D sugars have the â€“O- at C 5 on the right in the uncoiled form while L sugars have -O- at C 5 on the left. To state: From the cyclic structure of allose given, whether it is i) a furanose or pyranose form ii) Î±- or Î²- anomer iii) D or L sugar.

Question

Glycosaminoglycans (GAGs) are heteropolysaccharides composed of repeating disaccharide units. These units have some similar characteristics that allow them to be identified as GAGS. Which of the structures are examples of glycosaminoglycans? А. C. E. HO HO COO™ H Н ОН Н CH₂OH H H H OH OH Н CH₂OH Н OH H ОН o,so H H Н CH₂OH H H ОН H CH₂OSO H NH C=0 CH, H H Н NH c=0 CH3 H CH,OH OH Н ОН OH H B. D. Н НО H ОН H CH₂OH H ОН Н СОО ОН Н Н H H OSoz H Н OH б H CH₂OH ОН CH₂OSO H ОН H Н OSO, H Н NHSO,

Answer 1

Question

Chapter 25.SE, Problem 44AP

Interpretation Introduction

Interpretation:

From the cyclic structure of allose given, whether it is i) a furanose or pyranose form ii) Î±- or Î²- anomer iii) D or L sugar are to be stated.

Concept introduction:

The pyranose form is a cyclic hemiacetal form with a six membered ring formed by the nucleophilic addition of the â€“OH group on C₅ to the C₁ carbonyl group. The furanose form is a cyclic hemiacetal form with a five membered ring formed by the nucleophilic addition of the â€“OH group on C₅ to the C₂ carbonyl group.

The orientation of â€“OH group differs in Î±- and Î²- anomers. In Î±- anomer the OH on C₁ is cis to the â€“OH at the lowest chirality center in Fischer projection, while in Î²- anomer the â€“OH on C₁ is trans to the â€“OH at the lowest chirality center in Fischer projection.

D sugars have the â€“O- at C₅ on the right in the uncoiled form while L sugars have -O- at C₅ on the left.

To state:

From the cyclic structure of allose given, whether it is i) a furanose or pyranose form ii) Î±- or Î²- anomer iii) D or L sugar.

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Glycosaminoglycans (GAGs) are heteropolysaccharides composed of repeating disaccharide units. These units have some similar characteristics that allow them to be identified as GAGS. Which of the structures are examples of glycosaminoglycans? А. C. E. HO HO COO™ H Н ОН Н CH₂OH H H H OH OH Н CH₂OH Н OH H ОН o,so H H Н CH₂OH H H ОН H CH₂OSO H NH C=0 CH, H H Н NH c=0 CH3 H CH,OH OH Н ОН OH H B. D. Н НО H ОН H CH₂OH H ОН Н СОО ОН Н Н H H OSoz H Н OH б H CH₂OH ОН CH₂OSO H ОН H Н OSO, H Н NHSO,

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