Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 5, Problem 6TYU
What is the difference between linking glucose molecules with α-1,4-glycosidic linkages versus β-1,4-glycosidic linkages? What are the consequences?
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Chapter 5 Solutions
Biological Science (6th Edition)
Ch. 5 - 1. What are three ways monosaccharides differ from...Ch. 5 - Prob. 2TYKCh. 5 - Prob. 3TYKCh. 5 - 4. What are the primary functions of carbohydrates...Ch. 5 - Which of the differences listed here could be...Ch. 5 - What is the difference between linking glucose...Ch. 5 - Compare and contrast polysaccharides and nucleic...Ch. 5 - 8. Lysozyme, an enzyme found in human saliva,...Ch. 5 - SOCIETY Galactosemia is a potentially fatal...Ch. 5 - 10. If you hold a salty cracker in your mouth long...
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- An oligosaccharide is a repeating unit of a-D-galactopyranosyl-(a-1 >3)-allopyranoside. Each disaccharide unit is linked via B-1 --->4 glycosidic bond. The oligosaccharide has 10 monosaccharide residues. Required: Is this oligosaccharide a good substrate for glycolysis? Why or why not? Provide two reasons and discuss corn prehensively.arrow_forwardWhy is B-D-Glucopyranose in a chair conformation form is the most stable form of glucose present in our body?arrow_forwardGive the name of two Molecules of Farnesyl Pyrophosphate:arrow_forward
- Glucose 6-phosphate can be converted into a molecule of glucose 1-phosphate, which can undergo additional modification to eventually be added to a polymer of glycogen. Glycogen is simply a long, branched polysaccharide comprised of glucose subunits. The four major reactions of the glycogen synthesis pathway are listed below. Glucose 6-phosphate → Glucose 1-phosphate Glucose 1-phosphate + UTP → UDP-glucose + PPi PPi + H2O → 2 Pi UDP-glucose + Glycogenn → Glycogenn+1 + UDP glycogenn - a polymer of glycogen composed of n subunits of glucose glycogenn+1 - a polymer of glycogen composed of n+1 subunits of glucose PPi - pyrophosphate, which is an ion composed of two phosphate groups UTP - uridine triphosphate, a nucleic acid like ATP; it has three phosphate groups UDP - uridine diphosphate, identical to UTP but with two phosphate groups instead of three What is the net reaction for the four reactions shown above? Glucose 6-phosphate + UTP + Glycogenn + H2O → UDP-glucose +…arrow_forwardFrom which two monosaccharide units is the repeating disaccharide unit of chondroitin 6-sulfate derived?arrow_forwardSaccharide X, a sugar composed of repeating cellobiose and maltose, is a constituent of a glycoprotein. The saccharide is linked by a(1-2) linkages to three sialic acid residues, then O- linked to the glycoprotein. The glycoprotein is a glucose receptor. Running it through Benedict's Test produced negative results. What are 2 possible amino acids that is able to O-link with the saccharide? Show the part of both saccharide and protein where the bond is formed.arrow_forward
- 14C-Labeled glyceraldehyde 3-phosphate was added to a yeast extract. After a short time, fructose 1,6-bisphosphate labeled with 14C at C-3 andC-4 was isolated. What was the location of the 14C label in the starting glyceraldehyde 3- phosphate? Where did the second 14C label in fructose 1,6-bisphosphate come from? Explain.arrow_forwardDraw the structure of malibiose a sugar found in plants and answer the following question: a) What two monosaccharides are formed on hydrolysis of melibiose? b) Is melibiose a reducing sugar? Explain. c) Describe the glycosidic linkage between the two mono- saccharide units.arrow_forwardThe amount of branching (number of (α1→6) glycosidic bonds) in amylopectin can be determined by the following procedure. A sample of amylopectin is exhaustively methylated—treated with a methylating agent (methyl iodide) that replaces the hydrogen of every sugar hydroxyl witha methyl group, converting —OH to —OCH3 . All the glycosidic bonds in the treated sample are then hydrolyzed in aqueous acid, and the amount of 2,3-di-O-methylglucose so formed is determined.(a) Explain the basis of this procedure for determining the number of (α1→6) branch points in amylopectin. What happens to the unbranched glucose residues in amylopectin during the methylation and hydrolysis procedure?(b) A 258 mg sample of amylopectin treated as described above yielded 12.4 mg of 2,3-di-O-methylglucose. Determine what percentage of the glucose residues in the amylopectin contained an (α1→6) branch. (Assume that the average molecular weight of a glucose residue in amylopectin is 162 g/mol.)arrow_forward
- How many NTP molecules are required to synthesize glucose from each of the following compounds? (a) Glucose 6-phosphate (b) Fructose 1,6-bisphosphate (c) Two molecules of oxaloacetate (d) Two molecules of dihydroxyacetone phosphatearrow_forwardConsider 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-glucosearrow_forwardProvide an explanation for the fact that a-D-mannose is more stable than B-D-mannose, whereas the opposite is truc for glucose.arrow_forward
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