H ОН H О Н НО H OH H OH H ОН Н Н CH OH
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- Given the structure below: CH,OH но H. OH H H ОН НО Which of the following choices corresponds to the Fischer projection of the straight-chain form of the pyranose above? ÇHO н-с-он но-с-н H-c-OH н-с-он ČH,OH ҫно но-с-н но-с-н н-с-он н-с-он ČH,OH сно н-с-он н-с-он но-с-н н-с-он CH,OH сно но-с-н Н-с-он но-с-н H-c-OH снон ҫно H-C-OH но-с-н но-с-н H-c-OH Снон A B D E O A OB OC O D O EThe structure given below has what type of glycosidic linkage? CH,OH O. CH,OH OH HOM OH OH HO. O B(1-4) O a(1-4) O B(1-6) O a(1-6) PreviousWhich of the structures above is a component of sucrose and predominantly forms a furanose ring structure? A. H C I H-C-OH НО-С-Н I Н-С-ОН I H-C-OH I CH2OH A В D B. H =O но-с-н I но-с-н I н-с-он Н-С-ОН I CH₂OH CH2OH I c=0 I но-с-н I H— C -ОН H— C-OH CH₂OH D. COOH H-C-OH НО-С-Н I но-с-н I н-с-он CH₂OH
- In the biosynthesis of heme, ring cyclization, isomerization, and decarboxylation reactions take place. Identify the potential intermediates and show the electron flow in the following diagram. HO,C R1 HO2C- -R2 NH HN- но- NH HN- HO2C R R2 unstable intermediate Uro'gen II HO2C Me Me NH HN- -CO2H HN NH Me Me HO2C CO2H Coproporphyrinogen IIConvert the Fischer projection to the Haworth projection of the a-furanose form by moving the substituents to the appropriate positions. The anomeric carbon is shown. CH₂OH -H Cyclization -OH -OH CH₂OH Answer Bank CH₂OH HO- -H H- OHIn 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 newly made candidate substance. He thought he had been told to taste it. Luckily for him, the substance 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. It 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. They began 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. Many 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?Which of the following statements is TRUE for the enantiomer of the given monosaccharide? * ҫH,он H- -C-OH Но с -н H-C-OH ČH,OH It is an L-sugar that has opposite configuration around one carbon. It is a D-sugar that has opposite configuration around three carbons. O It is an L-sugar that has opposite configuration around three carbons. O It is a D-sugar that has opposite configuration around one carbon.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 16
- A bi O=P-O-CH₂ 0- D Ribose sugar H H- B E N HH F OH H H. C NGN -H N H N HBased 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 + H2O13. 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
