10. Which of the following is a reducing sugar? with explanation CH₂OH A B CH2OH CH3 OH OH بسمة CH2OH OH OH OH OH HO. C HOH2C OH HOH2C OH HO OH HO D CH₂OH OH OH E All the above
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- a) Which of the following monosaccharides will react with Tollens' reagent? Circle all that аpply. СООН CH2OH CH2OH OCH3 но- H- ОН HO FH OH CH2OH CH2OH OH II III IV V b) Decide whether the disaccharide shown below is a reducing or non-reducing sugar CH2OH но Но- ОН CH2 но Но OH OH 우 오Classify each of the following compounds as reducing or non-reducing sugars. Please be very clear in your explanation.TomnaLS Page < 3 7. For each disaccharide, indicate whether the glycosidic linkage is a or ß. CH,OH CH,OH OH но OH OH ОН ОН CH2OH OH но OH CH 2 HO O OH OH OH Identify each Fischer projection as the D- or L-isomer.
- CI H2O d) (R) CH;CCH2CH2CH3 ČH2CH3 e) Br NaOH CH3 Ez(d) Draw the structure of the expected product when monosaccharide B undergo mutarotation upon dissolving in water in the presence of Tollens reagent (AGNO3, NHẠOH). он OH O. OH OH OH monosaccharide BAcetylation: tro S 요 :0: CH3CO₂H HH 11 OH H 12 HH CH3
- The structures of an aldose and a ketose are shown here. An aldose contains an aldehyde group. Click on that group.What is the sugar classified as - ketopentose - aldohexose - aldopentose - ketohexoserivatives: Nucleophilic Acyl Substitution Reactions - EOC O C-O [References] One step in the gluconeogenesis pathway for the biosynthesis of glucose is the partial reduction of 3-phosphoglycerate to give glyceraldehyde 3-phosphate. The process occurs by phosphorylation with ATP to give 1,3-bisphosphoglycerate, reaction with a thiol group on the enzyme to give an enzyme-bound thioester, and reduction with NADH. H-C-OH ATP ADP CH₂OPO32- 3-phosphoglycerate 0= OPO32- C H-C-OH CH₂OPO32 1,3-bisphosphoglycerate Enz-SH PO43- O= C S-Enz H-C-OH CH₂OPO3² (Enzyme-bound thioester) NADH/H+ O=C NAD*, Enz-SH H H-C-OH CH₂OPO3²- glyceraldehyde 3-phosphate Propose a structure for the first intermediate in the reaction of the enzyme-bound thioester with NADH to form glyceraldehyde 3-phosphate. To simplify the drawing process, substitute the structure below for the enzyme-bound thioester. S-CH3 substitute for the CH2CH3 enzyme-bound thioester You do not have to consider stereochemistry. • You do not have…
- Classify the structures as being either an enantiomer, diastereomer or diastereomer/epimer of D-glucose. Structure A: CH H- -OH Structure B: но- H- H- OH Structure C: H- он H- -H D-Glucose: OH || CH CH CH он H- он но -H H- он но он но но- H- но H- OH OH но -- H- -H H -Ç-H Structure A: OH Structure B: OH Structure C: OHно CH₂OH Но НО anx CH₂OH НО OH CH3OH H* ӧ: H OH OH B-D-glucose Treatment of B-D-glucose with methanol in the presence of an acid catalyst converts it into a mixture of two compounds called methyl glucosides. Draw curved arrow to show the movement of electrons in this step of the reaction mechanism. Arrow-pushing Instructions HO H₂O CH₂OH Q-CH3 OCH3 + HO OH НО methyl B-D-glucoside CH₂OH -Ö: ний но НО CH₂OH НО он methyl a-D-glucoside OH OCH3 Н w-CH3 H2OWhich of the following will be oxidized by Tollens reagent to an acid? (image added)