1. An oligosaccharide is a repeating unit of a-D-galactopyranosyl- (a-1- 3)-allopyranoside.Each of the disaccharide unit is linked via B-1-->4 glycosidic bond. Identify and draw themolecular structure. Identify and draw the structure. The oligosaccharide has 10monosaccharide residuea. Upon the action of alpha-glycosidase, identify and draw all the possible products.b. What is the L-isomer of the Fisher projection of one epimer of D-allopyronoside.Draw the structure. Why is this an epimer of the monosaccharide?c. Is this saccharide a good substrate for glycolysis? Why or why not?

Disaccharide units are linked via beta-1->4 glycosidic bond. This means that for allopyranose we…

Answered: An oligosaccharide is a repeating unit…

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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Gentiobiose (D-Glc(ß1→6)D-Glc) is a disaccharide found in some plant glycosides. Draw the Haworth structure of gentiobiose based on its abbreviated name. Show all multiatom groups using the groups tool. Show stereochemistry using wedge (upward) or dash (downward) bonds.
Rhaminose is a trisaccharide comprised of fructose (B(2→1), fructose (B(2→1) and glucose. Draw the trisaccharide with the hexose in its chair conformations. Indicate the anomeric carbons, the non-reducing end and any other structural details of interest.
1. For the following trisaccharide: a. Provide the abbreviated name b. Draw the chemical structure using Haworth projections c. Identify the trisaccharide as reducing or nonreducing. Label the nonreducing and reducing ends (if present) of the molecule. O-B-D-N-acetylgalactofuranosyl-(1>4)-a-D-mannopyranosyl-(1>6)-D-3-deoxyglucopyranose
1. Cysteine is an important amino acid that stabilizes the structure of peptides and proteins by the formation of disulfide bond with another cysteine residue. Illustrate the titrimetric profile of cysteine and calculate its isoelectric pH. [Hint: The sulfhydryl group is titratable] 2. The tripeptide Glu-Pro-Arg (EPR) which is a product of Lactobacillus casei fermentation of milk was found to have potent blood pressure lowering properties. Draw the structure of the tripeptide, give its systematic name, show its titration profile, and determine its isoelectric pH.
A repeating unit of -D-glucopyranosyl-(-1—->6)-allopyranoside is called an oligosaccharide. A -1 —->4 glycosidic bond connects each disaccharide unit. Make a diagram of the molecular structure. There are ten monosaccharide residues in the oligosaccharide.a. Upon the action of beta glucosidase, draw the molecular structure of all possible resulting products. Briefly explain your answer b. Draw the L-isomer of the Fisher projection of one epimer of D-glucopyranoside. Explain why this is an epimer of the monosaccharide.c. Is this oligosaccharide a good substrate for glycolysis? Why or why not? Provide two reasons and discuss comprehensively.
Draw the structure of: The polysaccharide in (b) is dextran, a component of dental plaque. Here b: (b) a polysaccharide formed by joining D-glucose units in 1→6-α-glycosidic linkages
Identify which of the following structural polysaccharides (amylopectin, amylose, glycogen, cellulose, and chitin) fits the description given below. A specific description may apply to more than one of the polysaccharides. 1. Contains both a(1→4) and a(1→6) glycosidic linkages 2. Polymer chain is unbranched 3. Glucose derivatives are present in the polymer chain 4. Contains only ß(1→4) glycosidic linkages
For disaccharide b, give the monosaccharide units produced by hydrolysis, the type of glycosidic bond, and the name of the disaccharide, including a or 8. CHOH CH,OH H. OH H. HO Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help galactose and fructose When the disaccharide is hydrolyzed, the monosaccharide units that are produced are two molecules of fructose two molecules of glucose The type of glycosidic bond shown for the disaccharide in thin part is 8-1,4 The name of the disaccharide including a or A in B-1,2 a-1,4 a- 1,2 a-lactose B-lactose a-maltose B-maltose
OH CH2 OH What are the glycosidic linkages of the trisaccharide shown? a1 6, a1 5 O a1 6, B1-→6 O a1 6, B1-→5 a1→6, a1→6
Write the name for the trisaccharide depicted below (for example, of the form a - D - xylofuranose). Be sure to include if the sugars are in the pyranose or furanose conformations in the name and include the linkages between sugars (for example, (2 - - > 4)). CH₂OH ОН OH н ОН -CH₂ H\H ОН н н ОН CH2OH н ОН но н н ОН
Look at the structure of the disaccharide shown. Name the type of bond which is present. CH,OH H H он но CH2 Он H он H ÓH O B - 1, 4- N-glycosidic linkage O a- 1, 4- O-glycosidic linkage O B- 1, 4-0-glycosidic linkage O a- 1, 6- 0-glycosidic linkage O a- 1, 4- N-glycosidic linkage
In the structure in the picture, the monosaccharide units (alpha-D-galactopyranosyl and beta-D-allopyranose) are linked via alpha-1->3 glycosidic bond. Then, the formed disaccharide units are linked via beta-1->4 glycosidic bond. Then, an Oligosaccharide is formed which has 10 monosaccharide units, meaning that it contains 5 disaccharide units. Question: Is this oligosaccharide a good substrate for glycolysis? Provide two reasons for your answer.

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