. Provide an explanation for the fact that a-D-mannose is more stable than B-D-mannose, whereas the opposite is true for glucose.
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A:
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- Provide an explanation for the fact that a-D-mannose is more stable than B-D-mannose, whereas the opposite is truc for glucose.It is important to note that galactose is an important component of glyco- proteins. What is the effect on glycoprotein synthesis in case of galactosemic patients who are not given galactose in their diet? Explain this observation.Modify the structures of D-glucose and D-mannose to show a-D-glucosyl-(1→6)-D-mannosamine. H с H2C ОН с Н ОН Ni/ с ОН Н C I ОН Н 0 Н с CH₂ ОН Н ОН NM! с ジミ Н NH₂ ОН C | Н C
- Consider the Haworth projections of f-L-galactose and B-L-glucose shown here. ОН CH OH ОН ОН B-L-galactose enantiomers anomers OH diastereomers epimers ОН CH₂OH OH Which terms describe the relationship between these two sugars? ОН OH B-L-glucosea. Suppose that you have the peptide Ala-Gly-Tyr-His-Leu and you treat it with FDNB and then 6M HCl. Draw the structures of all the products that you will have in solution (assume all reactions to go to completion).Compare and contrast lactose intolerance with galactosemia.(Hint: Make a table.)
- Show the complete steps and products of the Haworth Projection structure of the following saccharides. The males have to answer the structure of D-sorbose and the females are the structure of D-mannose. (ANSWER ALL)Ketohexose sugars can form 8 different stereoisomers. How many of those isomers can be distinguished and resolved by TLC and why?Explain the basis for the following statement. For efficient conver- sion of galactose to glucose-1-phosphate, UDP-glucose need be present in catalytic amounts only.
- s N-acetyl-β-D-glucosamine a reducing sugar? What about D-gluconate? Is the disaccharide GlcN(α1→1α)Glc a reducing sugar?In total, including lactose, how many heterodisaccharides of D-galactose and O-glucose are possible?Commercially available high-energy formulas for premature infants are rich in triacylglycerols containing short- and medium-chain fatty acids esterified at the sn-3 position. Why?