Propose a mechanism for the following problems, please show every step! Thank you so much! All 3 problems
MECHANISM PROBLEMS 25-30 Galactose, one of the eight essential des (section 25-7), is biosynthesized from UDP glucose by galactose 4-epimerase, where uridylyl diphos ate (a ribonucleotide diphosphate: Section 28-1). The enzyme requires NAD for activity (Section 17-7), but it is not a stoichiometric reactant, and NADH is not a final reaction product. Propose a mechanism. CH20H HO. O- P-O-P-O-Uridine O-P-O Uridine UDP-Galactose UDP-Glucose 25-31 Mannose, one of the eight essential monosaccharides (section 25-7), is biosynthesized as its 6 phosphate derivative from fructose e-phosphate. No enzyme cofactor is required. Propose a mechanism. CH20H 2 OH OH HO Mannose 6-phosphate 6-phosphate 25-32 Glucosamine, one of the eight essential monosaccharides (Section 25-7), is biosynthesized as its 6-phosphate derivative from fructose 6-phosphate by reaction with ammonia. Propose a mechanism 2 o3POCH2 CH20H 2 NH3 H20 O3POCH2 Ho OH OH NH, Fructose Glucosamine 6-phosphate 6-phosphate