4. Gentiobiose (D-Glc(ẞ1-6)D-glc) is a disaccharide found in some plant glycosides. Draw Haworth structure of gentiobiose based on its abbreviated name. Is it a reducing sugar?
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- 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.1) Please list all glycosidic linkages between each monosaccharide units. For example, α(1→4)2) Please discuss whether these oligo/polysaccharides would be reducing or non-reducing sugar. Remember to state your reasoning in complete sentence.Draw both possible disaccharides of D-psicose and D-mannose that are joined by an α(1→4) glycosidic linkage. Are either of them now a reducing sugar?
- Which of the following is a non-reducing sugar? 2,3-di-O-methyl B-D-galactopyranoside 2-0-methyl-a-D-mannopyranoside Fructose 1-0-methyl-ß-D-glucopyranoside dextrinОН НО НО- ОН HO НО- OH ОН OH OH НО What are the monosachharides that make up this trisaccharide? a-D-glucopyranose, a-D-galactopyranose, B-D-fructofuranose a-D-galactopyranose, a-D-glucopyranose, a-D-fructofuranose a-D-glucopyranose, a-D-glucopyranose, B-D-fructofuranose a-D-glucopyranose, a-D-galactopyranose, a-D-fructofuranose1.Ala-Phe-Lys-Val-Val-Glu From the above polypeptide, what amino acid/s go/goes inside the cell after the following treatment: Chemotrypsin, thermolysin, then finally pepsin. What protein is left undigested? Write the primary structure of the undigested protein? 2.K-V-F-W-P-L-A-Y a.Chemotrypsin treatment b.Trypsin treatment c.Pepsin treatment d.Thermolysin treatment 3.Total acid hydrolysis of a pentapeptide complemented by total alkalinehydrolysis yields an equimolar mixture of 5 amino acids listed alphabetically, ala-cys,lys,phe,ser. N-terminal analysis with phenylisothiocyanate (PITC) generate PTH-ser. Trypsin digestion produces a tripeptide where N-terminal residue is cys and a dipeptide with ser as its N- terminal.Chemotrypsin digestion of the above tripeptide yields ala plus another dipeptide. A.What is the amino acid sequence of the tripeptide B.What is the amino acid sequence of the dipeptide derived from trypsin digestion? C.What is the primary structure of the original…
- 2) Consider the following disaccharide which was formed from the breakdown of a polysaccharide found in plant material. ОН Glycosidic linkage: H H OH H H НО H H. OH H. ОН OH H НО H ОН a. Label the glycosidic linkage above in the following format: a/B(# → #) b. Would you expect this disaccharide to have been formed from amylose or amylopectin? c. Describe at least two chemical tests that would give insight into the structure of this disaccharide, assuming you've isolated it and wanted to elucidate the structure from scratch. Include detail on not only the tests you would use but what results you would expect to get given the structure above. Assume you can analyze the structure of any monosaccharide you get from your chemical tests.Based on the structure of sucrose below, is it classified as a reducing sugar? ОН 6CH OH 5 5 ОН 3 6CH OH a-Glucose 2 ОН 0. ОН HO 3 1 ОН ОН 2 CH₂OH 1 B-Fructose ОН CH₂OH ОН CH₂OH ОН OH НО a, B (1-2) linkage CH₂OH Sucrose + H2OWhich of the following is/are reducing sugar/s?why? A CHOH CHOH CHOH OH OH CHOH OH CH,OH OH OH он C CHOH OH CHOH CHOH HỌ CH2OH OH OH OH OH ÓH u tte Select one: O a. Conly, it is a monosaccharide with a free carbonyl group O b. A and B only, both disaccharides are made from aldoses O C. B, C and D, they have at least one free carbonyl group O d. A and D only, both disaccharides are made from ketosis O. e. B and D, each has a free carboxyl group
- 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.Shown here is a monosachharide. How many total forms of this sugar are there? 1 CHO H-2 он н-3 он на I I H4OH + 0 0 0 0 8 2 5CH₂OH 16Write 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