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- 1. Examine the synthetic glycoprotein, Molecule A, shown below: Protein- OH OH OH OH OH ÓH OH Molecule A OH Draw the structures of the products obtained when Molecule A reacts under the following conditions. Justify your answer. If no reaction occurs, explain why. The monosaccharide rings that have not reacted may be represented by an “R" group. Mechanisms are not required. (а) Ammonium Carbonate, 5 days. (b) Excess Sodium Periodate. (c) 2,3-dinitrophenyl hydrazine under reductive amination conditions. NO2 O2N. „NHNH2 2,3-dinitrophenyl hydrazine1. Theoretically, a protein could assume a virtually infinite number of configurations and conformations. Suggestseveral features of proteins that drastically limit the actual number. 2. What are the greatest structural features that differentiate sphingolipids from phosphoglycerides? 3. High levels of glucose-6-phosphate inhibit glycolysis. If the concentration of glucose-6-phosphate decreases,activity is restored. Why?4. Draw structures for the following fatty acids: a. 16:1 or palmitoleic or 9-Hexadecanoic acid b. 18:3*2 a-linoleic acid or 9,12,15 Octadecatrienoic acid 5. Draw and name a typical triacylglycerol. 6. Explain why the flip-flop rate of phospholipids in biological membranes is far greater than in artificial lipid membranes.
- 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.1. Draw the structure of a cholesterol ester where cholesterol is esterified with palmitic acid. is this polar or nonpolar acid 2. Draw the strucutre of lecithin containing stearic acid on carbon 1 and arachidonic acid on carbon 2 of glycerol. is this polar or nonpolar acid 3.Disccuss the medical sginificance of cholesterol , cholesterol ester,l ecithin and choline . 4. Give examples of phosphoglycerides and sphingolipids of biological importance .30. The shown structure is a cyclic D-monosaccharide. Which of the following statements is true? HOCH₂ H OH H OH OH CH₂OH A. The chemical can react with methanol to form a hemiacetal in solution without forming an open chain structure B. The chemical needs to form an open chain structure to be able to react with methanol to produce a glycosidic linkage in solution C. Both A and B D. Neither A nor B
- 2) What is glycoside ? In neutral and basic solutions, glycosides do not show mutarotation. However, if the solutions are made acidic, glycosides show mutarotation. Explain why? And write a mutarotation mechanism.1. Most globular proteins are denatured and lose their activity when briefly heated to 65°C. However, globular proteins that contain multiple disulfide bonds often must be heated longer and at higher temperatures to denature them. Furthermore, upon cooling of the denatured proteins, the activity of these proteins can often be restored. Explain these properties.Why is glucose the most abundant monosaccharide in nature? A. Glucose is the most predominant monosaccharide because it has the most stable structure. E. Glucose is the primary energy source of most living organisms. C. In solution, glucose can exist in three forms, a and B anomers and linear structure D. Various polymeric structures (linear, branched, or helical) are possible with glucose. E. Glucose is quite polar and very soluble in water that comprises 75% of living organisms.
- Describe any two heteropolysaccharides in terms of: a. The types of monosaccharides involved b. types of glycosidic linkages, and c. possible hydrolysates1. 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. Make a series (at least 3) of drawings to show the three dehydration synthesis reactions that take place between the two Fatty Acids, the Phosphate Head and the Glycerol. Show the water molecules made. a) Label the following on the completed phospholipid: hydrophilic and hydrophobic parts of the molecule, fatty acids, phosphate group, and glycerol. b) Compare the structure of the phospholipid to that of a triglyceride. How are the two molecules Similar? How are they different? 2. Use the following vocabulary to label and draw a cell membrane: cytoplasm (cell lumen) extra-cellular fluid hydrophobic hydrophilic polar head non-polar tails a) How many O-H groups are there? And are the O-H areas of sucrose polar or non-polar? b) What is the term that is used to discuss how tightly or loosely an atom's nucleus has a hold of its valence electrons?