Answer 12 and 13 Thank you 12. Which pairing contains a sugar that will not show a reaction in Molisch'sTest?idose, guloseb. altrose, maltosec threose, xylosed. arabinose, sorbose12. Which choice contains only true atatements from those listed below?1.Cellulose is a polysaccharide bonded by beta linkages I. Glucose is themonosaccharide unit of amylose and amylopectin. II. Amylose is a linearchain of hundreds of glucose units IV. The dark blue solution that resultswhen starch undergoes the lodine test is cue to the presence ofamykopectin

Molisch's test: The biochemical test that is specific for the identification of carbohydrates in the…

12. Which pairing contains a sugar that will not show a reaction in Molisch's Test? a. idose, gulose b. altrose, maltose c threose, xylose d. arabinose, sorbose 13. Which choice contains only true statements from those listed below? 1. Cellulase is a polysaccharide bonded by beta linkages Il. Glucose is the monosaccharide unit of amylose and amylopectin. Il. Amylose is a linear chain of hundreds of glucose units IV. The dark blue solution that results when starchs undergoes tthe lodine test is cue to the presence of amykopectin

12. Which pairing contains a sugar that will not show a reaction in Molisch's Test? a. idose, gulose b. altrose, maltose c threose, xylose d. arabinose, sorbose 13. Which choice contains only true statements from those listed below? 1. Cellulase is a polysaccharide bonded by beta linkages Il. Glucose is the monosaccharide unit of amylose and amylopectin. Il. Amylose is a linear chain of hundreds of glucose units IV. The dark blue solution that results when starchs undergoes tthe lodine test is cue to the presence of amykopectin

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter3: Molecules Of Life

Section: Chapter Questions

Problem 2CT: In 1976, a team of chemists in the United Kingdom was developing new insecticides by modifying...

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Lactose is a disaccharide formed by the formation of a bond between glucose and glycosidic; lactose glycosidic; galactose hydrogen; sucrose hydrogen; fructose
In 1976, a team of chemists in the United Kingdom was developing new insecticides by modifying sugars with chlorine (Cl2), phosgene (Cl2CO), and other toxic gases. One young member of the team misunderstood his verbal instructions to test a new molecule. He thought he had been told to taste it. Luckily for him, the molecule was not toxic, but it was very sweet. It became the food additive sucralose. Sucralose has three chlorine atoms substituted for three hydroxyl groups of sucrose (table sugar): The altered sugar binds so strongly to the sweet-taste receptors on the tongue that the human brain perceives it as 600 times sweeter than sucrose. Sucralose was originally marketed as an artificial sweetener called Splenda, but it is now available under several other brand names. Researchers investigated whether the body recognizes sucralose as a carbohydrate by feeding sucralose labeled with 14C to volunteers. Analysis of the radioactive molecules in the volunteers urine and feces showed that 92.8 percent of the sucralose passed through the body without being altered. Some people are worried that the chlorine atoms impart toxicity to sucralose. How would you respond to that concern?
In 1976, a team of chemists in the United Kingdom was developing new insecticides by modifying sugars with chlorine (Cl2), phosgene (Cl2CO), and other toxic gases. One young member of the team misunderstood his verbal instructions to test a new molecule. He thought he had been told to taste it. Luckily for him, the molecule was not toxic, but it was very sweet. It became the food additive sucralose. Sucralose has three chlorine atoms substituted for three hydroxyl groups of sucrose (table sugar): The altered sugar binds so strongly to the sweet-taste receptors on the tongue that the human brain perceives it as 600 times sweeter than sucrose. Sucralose was originally marketed as an artificial sweetener called Splenda, but it is now available under several other brand names. Researchers investigated whether the body recognizes sucralose as a carbohydrate by feeding sucralose labeled with 14C to volunteers. Analysis of the radioactive molecules in the volunteers urine and feces showed that 92.8 percent of the sucralose passed through the body without being altered. Some people are worried that the chlorine atoms impart toxicity to sucralose. How would you respond to that concern?
1. Below are two isomers of mannose. Classify this sugar based on sugar number. Is this sugar an aldose or a ketose? Indicate which sugar is in the D conformation and which is in the L confirmation. Are these sugars enantiomers or diastereomers? H но-н НО- -Н Н- -ОН Н -ОН CH2OH Н- ІІ НО НО I OH -ОН Н– -Н CH₂OH =1
1. What is the reason why sucrose is a non reducing sugar? 2. In glycosidic linkage formation between monosaccharide units, discuss how products were formed.
3. Below are abbreviated Haworth projections of 4 sugars. Label the sugars as a or B. Which sugars are anomers of one another? Are these sugars furanoses or pyranoses? Are they hemiacetals or full acetals? What is the difference between hemiacetals and full acetals? ОН A نت ОН 5 -O ОН √3 2 1 OH OH 6 В OH ОН ОН 3 2 ОН ОН 4 6 с OH OH ОН НО 32 1 OH OH D OH ОН НО 3 OH 1
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"?
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
2. Name the disaccharide (shown at right) formed by glycosidic linkage of D-Glucose and D-Fructose. ● Name this disaccharide: Do you expect this disaccharide to be a reducing sugar? Briefly explain. OH HOCH₂ H CH₂OH I H OH H H HO OH H H O OH H CH₂OH
Consider the following carbohydrates: CHO CH2OH но H. OH OH H. OH CH,OH HO HH HO OH OH OH CH-OH CH,OH %3D II Which of these are D-sugars? O All are D-sugars I and II I and IlI Il and III All are L-sugars エ

13. Observe the diagrams below. Which sugar(s) is(are) epimers of xylose? Specify the carbon that is involved. HICIOH HIC-OH HIC-OH CH₂OH D-Ribose Figure 7-3 part 2 2013 of chemistry Seth Edition Five carbons HO-C-H D-Aldoses H- -OH H -C-OH -OH CH₂OH CH₂OH D-Arabinose D-Xylose H-C-OH HO-C-H H-C-OH H-C-OH 0 H-C-OH HOICIH CH₂OH D-Glucose H но- C-H HO -H H -C-OH CH₂OH D-Lyxose 14. Observe the structures below and determine: H HIC-OH CHO HOH HO-C-H HO-C-H OH- a. Which is an epimer of glucose: galactose or fructose? b. Which is a ketose of glucose? H-C-OH CH₂OH D-Galactose H н——он HOH CH₂OH D-glucose CHO он———н H- он——н он——н CH₂OH L-glucose CH₂OH C=0 HO-C-H H - C_OH -OH H-C-OH CH₂OH D-Fructose
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 CAT