OH но- HO он но но- OH
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Which of the following is the correct glycosidic bond linkage of the disaccharide shown?
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β-(1→6) glycosidic bond |
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α-(1→6) glycosidic bond |
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α-(1→1) glycosidic bond |
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β-(1→1) glycosidic bond |
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- When D-gulose forms a ring structure, a) b) a ketone and a hydroxyl group react to form a hemiketal. the ring is unstable at neutral pH. the ring contains four stereogenic centers. an intramolecular reaction creates a glycosidic bond.guanosine and a water bind in the active site, does not matter in which order. The scissile N-1 glycosidic bond between the anomeric carbon and N9 of the base is broken resulting in an oxocarbenium transition state. The leaving group electrons are not protonated, but instead swing up to form a double bond between N9 and C8. The double bond that is already present on the purine swings out on N7 and is protonated by an active site histidine acting as a general acid. An active site aspartate acts as a general base, and deprotonates the water substrate molecule. The deprotonated water is then free to attack the transition state in a manner that will generate an αribose. Draw the active site and show how the mechanism works. You will need to draw 3 or 4 different active site “snap-shots” to show the entire process. Be sure to clearly show the transition state and how it might be stabilizedIn 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 II
- A)Label each sugar as D or L b. Label each sugar as a or B1) Which of the following statement(s) regarding the ends of polysaccharides are true? All polysaccharides have at least one reducing end. Some polysaccharides may have no reducing end. Some polysaccharides may have no non-reducing ends. All polysaccharides have a N-glycosidic bond at their reducing ends. none of the above 2) The transformation of a monosaccharide into its ______ occurs easily and does not require the assistance of a catalyst. epimer anomer sugar alcohol diastereomer zwitterionCopper ions present in Benedict’s reagent react with the free end of any reducing sugars, such as glucose, when heated. Originally blue in color, these copper ions are reduced by the sugar and produce an orange-red colored precipitate. Alternatively, iodine-potassium iodide (IKI) may also be used when working with starch. IKI contains special tri-iodine ions which interact with the coiled structure of a starch polymer. Prior to a reaction, the IKI displays a yellow-brown color; however, after reacting with starch, a dark purple or black color is presented. The molecule pictured below produced a blue color when tested with Benedict’s reagent, a yellow color when tested with IKI, and a violet color when tested with Biuret reagent. Based on the structure shown below and these chemical results, what kind of biomolecule is this?
- Although the first two carbons of fructose and glucose are identical in structure to DHAP and GADP (from glycolysis), DHAP and GADP equilibriate on their in solution to favor the ketone over the aldehyde, while fructose and glucose do not. Why? a)The larger size of the molecule sterically hinders the isomerization b)The larger sugars have more OH groups which hydrogen bond and disrupt isomerization c)The larger sugars cyclize, and there is no carbonyl to isomerize in the cyclic form d)The larger sugars cyclize, and in the cyclic form the hydrogen bonding is very strong e)The larger sugars are less soluble in water than the smaller sugarsThe sugar molecules shown below are a) Enantiomers b) Epimers c) Anomers d) DiastereomersWhich of the following is NOT correctly paired? cellulose: beta-1,4-glycosidic linkage amylose: alpha-1,4-glycosidic linkage chitosan: alpha-1,4-glycosidic linkage cellubiose: beta-1,4-glycosidic linkage Which is NOT correctly paired?Immersive Reader fibrous protein: spherical alpha helix protein: right-handed coil beta pleated sheet: fully extended peptide chain globular protein: soluble in water
- Classify the monosaccharides. H H-C- -OH H-C- -OH H- CH₂OH D-erythrose H- CH₂OH FO -OH H. CH₂OH D-erythrulose H- -OH -OH H-C OH CH₂OH H- D-ribose CH₂OH OH H-C OH CH₂OH D-ribulose H H-C- CH₂OH D-glyceraldehyde -OH HO- -C- H- CH₂OH FO -H -C- -OH H-C OH CH₂OH D-fructose CH₂OH C=O CH₂OH Dihydroxyacetone triose Answer Bank ketose hexose aldose tetrose pentoseName the types of glycosidic bonds found in this olygomer, from left to right (from 1 to 3) CH 20H CH 2OH CH 2OH но OH OH OH OH OH OH O alpha1-1, alpha1-4, n O alpha1-4, alpha1-4, n O alpha1-4, beta1-2 O alpha1-4, beta1-4 O beta1-4, alpha 1-4 « Previous Next Not saved Submit QuizDescribe this glycosidic bond.
