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- 5- which of the following structures represent meso compounds? (a) (b) H. OH H. H.Shown here is a/anglycosidic linkage. CH₂OH CH₂OH I OH Н OH Н O Alpha Beta OL- O D- О Н I ОН HO OH -О Н Н H OH OHThe structure given below is a tetrasaccharide. i) For each pair of sugars (I-II, Il-III, III-IV), identify the type of linkage (i.e., 1→4, 1→6, etc.) that connects them. You do not have to specify whether the linkage is alpha or beta. ii) Identify all sugars that are in a furanose form. ОН ОН I HO- OH ОН О II Но OH Но НО HO- II ОН ОН IV
- what is the mechnism of it?1. Draw Haworth projections of B-D-arabinofuranose and a-L-mannopyranose. 2. Consider the structure of the disaccharide drawn at right: НО `CH2 В ОН (a) Give the names and D/L designation for the two monosaccharides linked together. H,C-O OHO „OH OH А: НО НО A В: ОН (b) In the structure, circle the anomeric carbon of each saccharide. (c) Is each saccharide present in its a or ß anomer? Specify both A and B (d) Would this disaccharide undergo mutarotation? Why or why not? (e) Would this disaccharide react with Tollens and/or Benedicts reagent? Why or why not? (f) There are two reasons this is very unlikely to be a naturally occurring disaccharide. What about its structure suggests this is true? Give both reasons.Draw all of the different possible aldotrioses of molecularformula C3H6O3.
- H3C CH;CN H C-CI + LİSH D3C For the reaction above, which is the 2nd step of the mechaACTIVITY-4. Refer to the structures below. Draw the Haworth formula (pyranose) -OH но H- FOH FOH- но но H- H FOH H FOH- H- CH2OH CH2OH Alpha-D- glucopyranose Beta-D-glucopyranose (Haworth) Beta-D-glucopyranose Alpha-D- glucopyranose (Haworth) ACTIVITY-5. Draw the Haworth formula for D-mannose and D-galactose. Label the alpha and beta anomer. CYCLIC FORMS OF FRUCTOSE D-fructose, a ketohexose sugar, can be presented using furanose and pyranose. Cyclic Fisher (furanose) 1 2OH Open chain Fisher Haworth formula (furanose) 1 CH2OH HOH,C- 1 2 F0 НО 3_H. ÇH2OH ÇH2OH но з—н 4 H- H но 2 H-4 HO- H- 5. OH 13 H-5 FOH 6 CH,OH 14 OH H. 6 CH2OH D-fructose Alpha form Alpha form Cyclic Fisher (pyranose) Haworth formula (pyranose) 1 HOH2C-2 3. 1 HO- CH2OH Но H. 5 он 2 H-4 HO- Но 4 OH 3 H-5 FHO- OH H-6 H Alpha form of D-fructose Alpha form of D-fructose ACTIVITY-6. Draw the Fisher and Haworth formula for beta-D-fructose (furanose and pyranose form). Label the beta furanose and beta pyranose.a Lactate dehydrogenase H H3C-C-coO- ОН ooc-C-CH3 L-(+)-Lactase Pyruvate This is a(an) b Creatine kinase CH3 O CH3 O H2N, АТР ADP NH2 NH2 Adenosine triphosphate Adenosine diphosphate Creatine Phosphocreatine This is a(an)
- The dynamic process by which both forms of a- and B-D-glucopyranose in solution change slowly into an equilibrium mixture of both is known as (choose the name). OH OH Но но НО HO OH OH OH OH a-D-glucopyranose 36% B-D-glucopyranose 64% OA Acetylation O B. Enediol Rearrangement OC Mutarotation O D. Acetal Formation O E EpimerizationH,O ? ÓTs 19.1. For lactose (below), OH OH НО НО OH 0 -ОН ОН OH (A) Circle and label any acetal groups (B) Circle and label any hemiacetal groups (C) Use an arrow to point to any glycoside bonds (D) What is the configuration (o or B) at the anomeric carbon of the "left" (E) Which ring (left or right) is in equilibrium with an open-chain form?