7. What is the best description of the following four molecules? HO CHZOH CH2 OH H- -O- H- OH НО НО -H- Но -H НО H- -OH- НО Но -H H -O- с он CHOH ČHJOH ?H2OH A. They are pentose. B. They are L-sugars. C. They are C-2 epimers. D. They are furanose. E. They are aldose.
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- 8) Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine, soybeans, and lentils. Because humans cannot digest it, its consumption causes flatulence. HO How ОН OH stachyose OH HO HO OH HO OH OH OH OH «ОН a. Label all glycoside bonds. b. Classify each glycosidic linkage as a or ẞ and use numbers to designate its location between two rings (e.g., 1-4-3). c. What products are formed when stachyose is hydrolyzed with H,O"? d. Is stachyose a reducing sugar? e. What product is formed when stachyose is treated with excess CHI, Ag₂O? f. What products are formed when the product in (e) is treated with H₂O"?4. Which among the given peptides will form hydrogen bond with another similar peptide chain? i. ASTGHASTGH ii. GASTHASTCH A. i B. ii C. i & iiFor D-arabinose: a. Draw its enantiomer. c. Draw a diastereomer that is not an epimer. b. Draw an epimer at C3. d. Draw a constitutional isomer that still contains a carbonyl group.
- Which of the following statements is correct regarding the structures below? CHO CHO H-OH ОН н ОН НО H НО -Н н- ОН CH₂OH CAB All are structures of D-sugars. All are structures of ketohexoses. Only CAR is a monosaccharide. 0 Only CAP is a L-sugar. Н I H CHO -ОН H-OH H-OH н- -ОН CH₂OH CAR H-OH -ОН НО-Н то н- H-OH CH₂OH CAP CH2OH to HO-H НО-н Н 1 - он CH₂OH CATWhich of the following statements is correct regarding the structures below? CHO CHO CHO -Н НО H НО н- ОН -Н - ОН CH2OH CAB All are structures of D-sugars. All are structures of ketohexoses. Only CAR is a monosaccharide. O Only CAP is a L-sugar. -ОН -ОН H-OH H-OH H- ОН CH₂OH CAR но-н H-OH н НО т н-он CH₂OH CAP CH₂OH Fo НО-Н H НО-Н H он CH₂OH CAT30. 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
- Sphingolipids do I. contain a glycerol core with a phosphocholine headgroup. II. contain a modified sphingosine. III. usually has a ceramide moiety IV. function as a precursor to sterols. O II, IV O II, II O , II, II O I, II, IV9. A pentose sugar reported to be present in heart cells (in 1 to 3 sentences, explain why this is your answer). а. хуlose b. arabinose с. [ухose d. xylulose 10. Which of the following is an epimeric pair? (in 1 to 3 sentences, explain why this is your answer). a. D-glucose and D-mannose b. D-glucose and D-galactose c. D-glucose and L-glucose d. both A and BWhat is the glycosidic linkage between monosaccharide I and II? α-(1→2) β-(1→2) β-(1→3) α-(1→3)
- 1. Is the disaccharide reducing? Yes or no and why. 2. Will the disachharide react positively with benedicts reagent? Yes or No. 3. What is the specific glycosidic linkage of the disacchride? A. alpha-1,4 glycosidic linkage B. beta-1,3 glycosidic linkage C. alpha-1,3 glycosidic linkage D. beta-1,4 glycosidic linkage1. What is the reason why sucrose is a non reducing sugar? 2. In glycosidic linkage formation between monosaccharide units, discuss how products were formed.13. Which statement(s) correctly describe this disaccharide? CH2OH CH2OH A. It's the alpha anomer, and it's a reducing sugar. CH-O CH-O OH B. It's the alpha anomer, and it's a nonreducing sugar. CH CH CH CH OH C. It's the beta anomer, and it's a reducing sugar. ОН СН—СH CH-CH D. It's the beta anomer, and it's a nonreducing sugar. OH OH OH