32 Draw the Fischer projections for the oxidation and reduc- tion of the following sugars at the aldehyde carbon: (a) CHO (b) CHO HO-C-H H-C-OH | H-C-OH 1 H-C-OH 1 CH₂OH (c) D-Ribose CHO HO-C-H To be HO-C-H H-C-OH | HO-C-OH 1 CH₂OH (d) H-C-OH H-C-OH | CH₂OH D-Arabinose CHO | H-C-OH HO-C-H | H-C-OH CH₂OH D-Xylose

which if any, of the following structures represent mesl compouds? (Blue 5 N , green 5 Cl.)

Which shows the chair conformation of B-D-glucopyranose (Fisher projection shown below)? CHO H-OH HO-H H- -ОН H- -ОН ČH2OH OH OH HO ÓH OH OH OH Но- OH Он HỌ HO- HO он Но OH OH

H-C -OH CH₂OPO₂²- 3-phosphoglycerate ATP ADP Arrow-pushing Instructions AC XT H-C-OH :O: CH₂OPO3²- =C² H-C-OH -O OPO3² Enz-SH 3 CH₂OPO3²- 1,3-bisphosphoglycerate ADP PO S-Enz H-C-OH CH₂OPO3²- 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. Draw curved arrows to show the movement of electrons in this step of the reaction mechanism. [Enzyme-bound thioester] NADH/H* NAD*, Enz-SH H H-C-OH CH₂OPO3²- Glyceraldehyde 3-phosphate :Ö: H-C-OH CH₂OPO3²- ADP 29

Please draw the fischer projections for the following compounds and determine whether they are (R) or (S)   Thank you